First of all i would like to say that i really believe RJ is a man, so i dismiss all women as suspects ...
Those theories don't make sense to me.
Second i think that RJ is one of the 30 man list and no one like "PJ father" or "Lisbon's brother" or even "Van Pelt's father" ...
I would also like to point out two things:
First - Lorelai said: "...you haven't become lifelong friends..." so with only this sentence i dismiss Cho and Rigsby but keep suspects like Stiles and Mashburn ... They get along with jane and some might even say they are is friends but they aren't, for sure, his lifelong friends.
Second - Everyone follows what Rosalind Harker said as if it is a certainty ... I would only like to say a couple things ... First ... It's easy for anyone to get fatter, slimmer, shave, get a beard or a moustache, let his hair get a little longer or even shave his head ... Besides ... From what i observed, and i asked a lot a people, even some blind people ... Describe someone's height isn't simple or even clear ... Most of people fail by a margin of error of 2/3 inches ... that margin gets even bigger with taller people ... Blind people make the same mistakes ... And their margin of error, from what i observed, is a inch or two higher ... So 3/4 (sometimes even 5) inches ... Besides ... Everyone can "look" taller or shorter ... With some simple things as bending the knees all the time or having a hump ... The fact we can all see the bending knees and the hump but no one can tell for sure how much taller a person is based on that ...
A person can also "look" taller if uses some objects in the shoes or socks ...
My list for the final 7 in last name's alphabetical order (and this is the list i think they will make, not my top 7 suspects ... i will put some of the most popular motives for the suspicion on these characters):
1 - Dr. Royston Daniels: he has the power, money, connections, charismatic personality and the could have the network ... He is a ladiesman and fits rosalind harker's description ... He also has that hypnotic mambo jambo :D
2 - Ray Haffner: member of visualise and with that could have the network and connections ... Has some power and a bit of money ... I can see him having the necessary charisma ... Basic description fits rosalind harker's ...
3 - Robert Kirkland: His basic description fits rosalind harker's, he has the power, connections and could've the money ... He has a very suspicious behavior and he has been following jane's investigation ...
4 - Ellis Mars: the whole "tyger, tyger" thing ... Mars is the red planet ... He also acts like a psychic, the elliston farm thing and at last the "he is mar" anagram to Ellis Mars ...
5 - Walter Mashburn: He has the money, power, connections, the whole Mashburn/Lisbon/Jane triangle would be a great drama, has charisma and also is a bit of a ladiesman ... His general description fits with rosalind harker's except his height ... He is playful (the way he keeps joking about being suspect and next time really being the killer), he reads people well, he seems like a hard worker (from some things mentioned before - in other posts - i think he worked hard for his money), he has a troubled past, seems to like the danger (the way he gets into a car with jane, not knowing jane at all, and lets jane drive blindfolded) ... Seems to have a dark side, knows a little of espionage (the way he turns his competitor employee), and seems to think everyone could get away with murder as long as the murder was well planned.
6 - Brett Partridge: has the knowledge of forensics, investigates RJ's copycats crime scenes, basic description fits with rosalind harker's, has a macabre look, most of you seem to think his voice and RJ's are similar (it really doesn't seem that similar to me, but i guess it's a matter of opinion), has some cbi connections ...
7 - Max Winter: seems to have the money, the power, the connections, the charisma and the thing with the gun he gives jane would be a whole new simbolism ... also fits the basic description of rosalind harker ...
All these suspects seem to be old enough and young enough to be RJ ...
Also like Tolman Bunting (mainly for his brain) and Osvaldo Ardilles as suspects ...