Hey guys, i'm not gonna escribe a pretty large text saying what everyone here has already said.
I will leave you with an image that i've done:

http://i.imgur.com/6Ez7I0R.jpg

I've found that old lady feeding the pigeons REALLY weird when i saw this ep. Also, remember the pigeons in the first ep? Then i started thinking and got to this. 
Really don't know if this is relevant at all, just a thing that i wanted to share with you guys!
Thanks!

I believe it's Ray Haffner for the following reasons:

1.) When he temporarily took over for Lisbon and was running the team pretty much everything he did or said revolved around Jane. He clearly wanted to work with Jane, observe him etc. He questioned Cho about Jane and if he thought he was smarter. For a man so high up in the CBI he acted foolishly falling for Jane's trick thus getting replaced with Lisbon who was put back in her old job. I believe this was his chance to work with Jane up close, really get to know him and his team and have a bit of a joke playing a "buffoon" they all underestimated (while having the last laugh). He didn't want the job long term and played along so he would get fired after learning what he needed to.

2.) Lorelei, who had never met Lisbon before, makes the statement "I think you're a little bit in love with her" to Patrick Jane. Why would she conclude this so quickly? I believe it's Red John's opinion she is repeating. It's also why Red John requested Teresa's head as proof of his loyalty. He knows how much Jane cares for her and was asking him to make the ultimate sacrifice to prove Jane was truly on his side knowing he probably wouldn't. Red John learned exactly how much. Jane cared for Lisbon when he worked so hard to get Lisbon her job back.

3.) When. Ray. Haffner appears again he tries to lure Lisbon away from the CBI with the offer of a lucrative job. When she declines he asks her if the real reason isn't that she loves her job but because of Jane. He says she "deserves better" and that Jane will eventually leave her. He makes no secret of the fact he thinks a lot of her and makes it as much about a choice between jane and him.

4.) In the Red Barn episode one of the first things he asks Lisbon about is how Jane pulled off the trick with the Red john symbol. He also doesn't answer lisbons question about working on the farm and asks if they are still friends.

5.) in one of the first episodes with Bret Stiles he implies he knows so much about Red John and that RJ wants to "take away" everyone that Jane cares about (like Ray is trying to do). He also says it's a kind of love RJ has for Jane. That's why RJ had kidnapped (Kristine?) the psychic. Ray and RJ have a similar fixation with. Lisbon in the last few seasons.

6.) Ray was involved with visualize and still is? Bret Stiles could be his father or former mentor which is why he knows so much and protects him.

7.) Red John "marked" Lisbon but didn't otherwise harm her. Does this mean he ran out of time or that he wants to "claim" her from Jane? He's never left anyone unharmed before.

8.) Ray has the most outwardly pleasant demeanor and is the best fit of the "descriptions" of Red. John. It's hard to imagine many of the other suspects being the romantic figure described by the women who have defended him, been brainwashed and killed for him.

9). He was in the CBI and would have had the knowledge to infiltrate the teams and turn Sam Bosco's secretary so she would murder him and Jane would get his case back.

Everyone seems to think that Red John is taking Jane on a journey, but I think it is Jane that is taking RJ on a trip.
I think Jane knows who RJ is.
If you watch how Jane works, he often designs a trap for the perpetrator. 
Jane often plays along with misinformation to lead the perp where he wants them.
I don't believe that RJ is on the list of 7 suspects-Jane set this up. 
I believe that some of the people on the list of 7 are complicit with Red John, which is why Jane doesn't get upset if they die.
I don't believe the clues on Sophie's recording to be completely true-I believe that Jane got Sophie to make the recording to help set a trap for RJ.
I think Jane will use some of the suspects as part of his trap.

That is all I have at the moment.

What I know for sure:

I would like to see Mashburn again-(and I think he might be RJ).

I would love to see Jane reclining on that sofa in his underwear.
New mystery to be solved: Boxers or briefs?

One of the four patients on Sophie Miller`s list is named Mitchell Livingstone Washburn. I don`t know if it is just a coincidence, or a clue. I just found it weird and I wanted to know your opinion, too. 

I'm a bit confused at the moment! Jane has narrowed the suspect pool down to 7 persons - or 6 now Partridge is dead. If he believes, that he can trust Rosalind Harker - which I personally think, that he - and we can! (since we saw Red John in her house sitting on a lounge chair with a cup of tea in the episode "Red Is The New Black" and the fact that Jane believes her, when he called her to a morgue to identyfy the body of Timothy Carter as not being Red John in "Little Red Book")
Then why this broard suspect pool? Rosalind describes RJ as: very charming personality, "just under 6 feet tall" with short straight hair and I know that she is blind, but she has to be able to put an average age and bodytype on him. And why didn't Jane just record the suspects voices, have Lisbon locate her in witness protection, and then go have her identify RJ by his voice? I mean she spent 5 month living with the guy!

Being a genious I don't understand why Jane doesn't take this into consideration. Have I missed anything?

My primesuspect for quite sometime has been Bertram, but I recently switched my focus to Haffner. I think Bertram might be to old, I wouldn't necessarily call him a charming personality and I don't really see him as this charismatic persona, who can get so many people to do his bidding  :-D
But then again Haffner did act extremely suspicios in the hospital, so he might be killed of soon ;-)

Guys I've found another strong connection between RJ and Ray Haffner.

Look at how Ray Haffner claps on Cho's shirt:
http://www.youtube.com/watch?v=ZKWkOauew4A (0:27-0:28)

And then look at RJ when he claps at PJ's shirt at season two finale:
http://www.youtube.com/watch?v=ns_DWnqrEdI (2:10-2:11)

Amazing, isn't it?