I am a huge Christian fan, but I don't want him to win this year. He isn't going to be in it anyway if recent reports about him possibly not being ready even for Wrestlemania are to be believed.
I really just don't want to see any returning superstar winning the Rumble this year as it's already been done twice in the last 3 years, and many, including myself, consider that a bit too much. That rules out Christian, Triple H, The Undertaker and Chris Jericho.
I'm going to assume that the losers of the championship matches won't be in the Rumble as they usually aren't, which rules out Randy Orton, Edge, The Miz and Dolph Ziggler.
The only superstars I can then see realistically winning are any of the following. John Cena, CM Punk, John Morrison, Kane, Sheamus or Alberto Del Rio. No way Mysterio is winning again, hopefully.
I don't think the CM Punk-John Cena feud needs the title on it, but neither does Sheamus vs Triple H - both possible matches for this years Mania. - but all of those men could feasibly win it. I'd love Punk to win it though as he has been consistently great for a good while now.
Kane is another who I think deserves the win, he finally got a decent title run this year, and a Rumble win would be a nice thank you to him for his years of service, although as I suspect he doesn't plan to wrestle for much longer, it could be considered a waist to give him the win.
This brings us to John Morrison and Alberto Del Rio. Morrison has been getting better and better and his title match against The Miz a few weeks ago on Raw was outstanding. He is a bit like Jeff Hardy imo, but with much more to him than the crazy bumps Hardy relied on too heavily. And he isn't a messed up idiot, but that's another matter. Del Rio on the other hand is a relative newcomer, and has been very impressive so far, and could easily be given the Rumble win to take him to that next level, and it could lead nicely to a Del Rio vs Edge match at Mania.
There are several men who could win, I'll just be happy if it isn't a returning superstar or Mysterio! But my main picks in no order are Punk, Del Rio, Kane and Morrison.