There are some crazy theories here. I will explain why i don't think its one of the names in the list, i know what Heller said. I don't want to believe that. That is the magic of 'The Mentalist'. Its unexpected.
Also the list has some stupid names which would be a real letdown if one of them was RJ. Lets go over the names :

Out of 7 :

1. Bertrum - Already proven in the final episode of season 3 or 4 that its not him. Its highly unlikely he hired that girl and O' Laughlin.

2. Patridge - NO. Only shown in 3 episodes and why would he tell Jane that its not RJ when it is RJ since RJ is doing this all for Jane. Also too obvious and too much evidence towards him which is out of the nature of the series to go with the one that the evidence is pointing.

3. Sheriff i dont know his name - Saw him only once in season 1. That proves all . If an unknown character is RJ, then the series is retarded.

4. Bret Stilles - Too obvious i think but its plausible since he owns visualize and basically can persuade a lot of people about crazy stuff, maybe the people working for him were manipulated which he is good at that. But again too obvious.

5. Ray Haffner - Not really that manipulative. Why would he leave the CBI if he was RJ. Fine ok lets say his RJ. Supposedly He left because he didn't have to be a mole anymore since he stopped killing for some time anyway and Jane had given up. Then why propose Lisbon to follow him in that job thing. Doesnt make sense at all. Could be an accomplice but unlikely.

6. Bob Kirkland - Really obvious. Maybe an accomplice or some people say an enemy but why if he was an enemy of RJ kill that guy who was at the hospital who knew who RJ was.

7. Dr. Forgot his name :D - Not him. Hardly seen him and again it would be a letdown.

Finally maybe more story is going to be revealed for each character in season 6 i think. That would be the real time to start guessing and investigating. Most people here are throwing long shots like me. Its too early.

I believe it's none of the suspects. But it's from the team that got hold of the Strategic Mindmap that was located in Patrick's Rooftop Room. 

The reason I am saying is that, Patrick already knew that the room would be explored and everything copied from it. He squeezed a toothpick in the door and later when he arrived he saw that the toothpick was not on the door, but on the floor. So the team that investigated what's in the room already had the 7 major suspects.Therefore, RJ, who is somewhat related to this team, already knew Patrick's shortlist and then acted as he had foreseen his list on the episode finale video.  

I think Patrick will utilize his tactic to make RJ feel more intelligent than himself and look for deficiencies on RJ actions. In the end, it's a multi million dollar series and the longer it gets, the more profit it leaves to producers and actors. Therefore, making it longer than needed is something that is at their benefit, of course. 

Regardless of who Red John is, I think it would be awesome for Bruno to do a show based on the life of Red John during the same time line.  It would be amazing to see how he can persuade and run this organization while keeping a regular life in the eyes of the general public.

Red John is Amos Van Pelt aka Sheriff McAllister.  Grace is working for her father as a mole at CBI. 

I highly doubt that any of the seven suspects on the list are red john. We've got two more seasons to go and it wouldn't be that easy to choose between seven people. There's going to be a twist and Jane will have to start over. I've got two people that I feel could possibly be red john and know James memories:

1. Alex Jane. Its been said before and the points against it are good but if Bret stiles could potentially be RJ then Alex Jane could be as well. I mean all he does is stab a few girls. You don't have to be gym junkie to be able to do that and even 60 year old men are stronger than most sleeping women. As for killing jane 's family suddenly could be because Jane slandered him and he did it to show his dominance over Jane. After all he did bully Jane and with Jane going to the carter springs place and the Irish guy saying his dad was wicked comparing Jane to him it seems like huge hint. Plus we haven't seen his actual appearance outside of the flashback and with all these hints were bound to see him unless he's dead.

2. This is a far shot but it could be the owner of the mental hospital Jane was in. He could easily drug Jane and hypnotize him finding out his thoughts, ambitions and memories plus all the accomplices are screwed up so he could "cure" them and turn them into accomplices via brainwashing. Sort of like visualize but with paranoid schizophrenics and deeply tortured souls. Makes perfect sense. His web of followers could branch out from this because even normal people have mental breakdowns especially if red john is the one causing that breakdown and pain in order to get them to go to the mental hospital so he can work with them and make them do his dirty work all in the name of liberation and his grand scheme Rebecca was talking about.Could also be a part time psychologist. Plus this would give him tons of money, skills, willing subordinates, and most importantly motive. He wants an army of cdazies to take over the world, show them his pain and then guide them down a " higher path."

I think we will soon learn a little bit more about Van Pelt. We all know she has a dark past that nobody knows about. They briefly more than once talked about it, (like when Jane tells her, or when she talks to her RJ crazy ex BF in the wood).

Plus she is Red haired and I know for a fact that in the real life she's not. A lot of Red Haired woman in this show. But more than anything, we know something happened, but we know just little enough to not pay too much attention...

Then, I don't think RJ is on the list. The writters of this show are always looking for a twist and surprises. What a let down if you know in advance for an entire season a liste of suspect; that would definatly remove the surprise of the big finale.
And also. Anybody on the list, would be a let down.
Brett Style ? Too expected. Highly suspectable because of his capabilities and they showed us more than once that he could be.
Same for Kirkland, after what they did, it is evident that the audience suspect him somehow someway.

The sheriff or the guy of the FBI ? We'll barely saw them, what a let down if suddenly TADAAAAAA it was them !!!!! Ea-sy... Doesnt show a lot of imagination for a big finale.

The boss of the CBI and the other one ? Please... Take a moment to imagine it is in fact one of them... That's not really likely and exiting ...

Brett Paridge would be a good thing, but ... I don't know...

My opinion is that the list is a distraction. The writters will make their best to make RJ somebody never expected ! With this list, the surprise effect is dead anymore.

I think maybe all this thing never existed, it is all in the head of PJ. In fact he's crazy and in an hospital. That's why we had a flash of him in the bed when he sees his daughter, when he takes the drugg, that's why also all the crazy thing can happen in the show (like the other ones believing she's dead).

A big finale like fight club... But ending with him in a Psy hospital with a lot of delusions.

If it is not, I can believe it is his father or something like that.
But I think Van Pelt has a role and we'll know more about her soon. What is already, she had a sister who died ? something like that ? She said no but PJ said she had a rough childhood....

Now, I'm pretty sure it's not going to be as easy as Bruno Heller made it loke in his later interview. He's making us believe that one of the names on that list is going to turn out as Red John. No twist plots.
However, I can't believe him.
First of all, many of the subjects of the list such as McAllister or Reede Smith are just ridiculous. Who wouldn't feel disappointed if, after 5 seasons, a character that has only been shown once or twice, ends up being Red John?
And I'm sure their goal is not, at least willingly, to disappoint the audience.
Some other subjects like Stiles, Bertram, Partridge or even Kirkland might be better choices. They've been dropping "subtile" clues throughout the latest seasons, just to keep us busy and thinking, believing that we're smart enough to figure out who Red John is.
In my opinion, Red John's identity will surely disappoint all of us. We've been waiting for him for too long. However, the writers like having fun and I really think that Heller has played us all by saying that the real name is "on the list".
What if that one's not THE LIST? What if Patrick is really one step ahead of him?
I find the theories about the personality disorder absolutely ridiculous. Taking that into account, I think they'll surprise us next season with another of Jane's tricks, although I'm certain that we're quite close to knowing a lot more about his real identity.