It's simple:

Red John (His Red Right Hand) http://img29.imageshack.us/img29/7037/4sh2.png
Brett http://images2.wikia.nocookie.net/__cb20100620225057/thementalist/images/4/4e/Brett.png

Look at the noses and the elongated face. From other small glances at RJ (again in His Red Right Hand, dont have an image) when RJ poisons the lady (I forgot her name at the moment) you catch a one frame second of RJ. He has short black hair. Rules out a few right there. 

The remaining suspects have fat short noses and/or more round faces. 

After rewatching the season 4 finale I think McAllister is going to be Red John.
I think I've made some very interesting observations about the episode so let me know what you guys think

1) RJ starts the conversation by saying "Debonair at all costs". If you look at the car chase, the Lady who shoots the car with Lorelei in it comes from the Debonair intersection. She may be connected to RJ and if you look closely she makes no attempt to shoot Lorelei, only the driver and the man in the back. I think RJ planned everything out, knowing that Lorelei would get caught which would go back to "at all costs" because he didn't want to give up Lorelei  but in order to get to Patrick he had to give her away. Maybe its all part of a plan to mess with Patrick by getting her to state information that would lead Patrick to believe false ideas

2) If you look at when Patrick and Lisbon are holding hands, a random police car comes to the scene. This barely goes noticed because everyone is focusing on Patrick and Lisbon, but why would a random police officer show up to an FBI case? I think RJ is the man in the police car and it makes sense that it would be McAllister, as he is a sheriff.

My own theory is that McAllister is RJ and the rest of the suspects are his disciples. wouldn't it make sense that RJ is more than just one person? RJ can use his disciples to get all of his information. It would seem reasonable that the real RJ wouldn't want any information about himself to be known, so it's possible he's the man we know the least about which also fits McAllister.

Lorelei Martins dies in S05E16.. So the video of her stating the seven suspects should have taken place before that, whereas Bob Kirkland breaks into Jane's workplace only in S05E19. So, this rules out the chances of Bob Kirkland being Red John or even a messenger to Red John.  Whatever data Bob has, it is most  likely a set of tampered information, so as to divert him from the real trail leading to Red John, irrespective of for whatever reason Bob needs Jane's info.

think about it and look at like this :
the 7 suspects is a joke,why? think about it....patrick has been working on the suspects for a long time almost since the beginning of season 5....wayyyy before the 7 suspects patrick used a toothpick on the door to his room,therefore any smart person would think patrick has aplan that NOBODY KNOWS.therefore anything that kirkland found has been tampered with or in other words everything kirkland found was because patrick wanted him to find or whoever entered his room.therefore after the season finale when patrick saw the dvd he knew who entered his room.therefore the list is fake made by patrick by leaving the right clues so that the certain people were found as suspects therefore having the upperhand....which explains why people like the sherriff and reid were on the list to throw red john off and make him think that patrick is way off and really has no idea who he really is...i have a feeling that patrick already knows who red john is he is just waiting for the right time to make his move.....and for some reason laureli martins have something to do with this.I wouldn;t be surprise if another video surfaces before the end of the season telling patrick who red john is ....or something very very especific....also teresa could be being pressure by red john somehow so patrick would tell her what he knows about his identity,buy patrick is not falling for that....so far.....think about this: what character makes perfect sense as red john? let say for the sake of argument that bob kirkland is revealed as red john....after so many seasons if the show ends doesn't the audience have to see somehow red john in the other seasons?if red john or bob kirkland the audience can't place them in other seasons WHAT WOULD THE POINT BE FOR WATHCHING THE REST OF THE SEASONS?....to me gale bertram makes perfect sense because he was somehow involved in some season finales and some very important scenes related to red john....and kirkland is the one that gave gale  the info in the room..either willingly or by blackmail by gale or whoever red john is.....MAKES SENSE TO ME !