My top 2 choices have been Ray Haffner and Thomas McAllister, and last night's episode further confirmed my belief.

Several things I've noticed:

1. When Lisbon tells Haffner that RJ did not hurt her, he does not give the response you would typically expect from someone who's genuinely concerned.  Instead of saying "wow! you got lucky! That's great!," he responds matter of factly "good for you."  It almost seems like Haffner wanted Lisbon to get hurt, but somehow the plans got foiled.  Perhaps RJ has a phobia of pigeons and had to leave the house due to all the birds?

2. During the meeting with the 3 RJ suspects, Bertram and Smith look visibly nervous while McAllister is not.  He looked genuinely surprised, as if he has no idea what Jane is talking about.  Perhaps RJ is a great actor?

3. Based on Sophie Miller's description of "Jay Roth," I think we can safely rule out Bret Stiles and Reed Smith.  The former is not middle-aged, and the latter is obviously not in good health.

4. I think the big clue in the last sequence of the season premiere is that Red John is left handed.  On last night's episode, we see Sheriff McAllister walking casually.  His left hand is at his belt while his right hand is swinging freely.  Something off about that.  It's not how normal men walk around. 

5. I think there's a good chance that Haffner is Stiles' son.  I don't think Stiles is RJ, but he definitely knows who RJ is and has a connection to him that goes way beyond what anyone else has presumed.

I have known Bob Kirkland to be Red John for a long time. Fine, I
shouldn't say I "know" because it's just my theory, but I do know! Why?
Because Kirkland has been around for a long time. He is in homeland
security and has a lot of power. The main reason I suspect him, however,
is because once he passed by Jane in the CBI office, and Jane turned
and look at him and said, have we met? And Kirkland said no. And that
was it. Now, that scene has no point to it whatsoever to that episode or
later. That's when I first realized that Kirkland had to be Red John. This is long before Jane came up with his list.

Furthermore,
the other five suspects are not right. Bertram the CBI isn't that
smart; he was once suspected as a link to Red John during the time when
Jane shot the fake Red John, and Bertram didn't have a clue. Jane pulled
the wool over Ray Haffner without sweating at all. Reede Smith is just a
stupid FBI guy. McAllister is just a policeman with no significance; we
hardly ever see him, and you can be sure that we do see Red John off
and on in the episode.

Bret Stiles is the mostly likely next
suspect because he has lots of power too, but he can't be it because he
already has a big following. Like Jane says once, Bret couldn't hurt a
fly. (When he does, he doesn't do it himself, certainly.) He is just not the hands-on killer that Red John is.

Therefore, it makes total sense that Bob Kirkland is it. He is also handsome, meaning that he can easy sucker women into doing his bidding.

Therefore, I know it's Kirkland.

Sophie Miller said the he is "is an excellent whistler"...they showed us the sheriff McCallister whistling in that right moment, but in the same episode we've seen Ray Haffner whistling too...I have three possibilities thought...Haffner,McCallister,Bob Kirkland...I'll watch all 29 (plus that ones of this season)Red John's episodes till 17th of november when there'll be the episode "Red John"

When PJ found out some people had broken into his room he smiled.meaning he had a plan.he wanted them to find those info so they RJ could analyze it so get to the 7 names.PJ also knows that none of them is RJ because if he knew all he needed to do was to take Rosalind in and she would indentify RJ.after RJ left those 3 in that meeting we could tell that they all knew who RJ was.these 7 are all accomplices/assistants. the assist RJ and cover up where ever he messes up.I don't know exactly who RJ is but I'm sure he's someone we all know.he's right in front of us but we can't see him because we are missing the BIG picture here.