Florida has the best talent in the division, but they won't win too many conference games with the QB situation in flux.
Georiga is playing much better football right now, particularly on defense. But they've faced three middling conference opponents with very little depth. Florida and Auburn will test them.
South Carolina is the enigma of the group. They've got the most experienced team and I think they're the most capable of the three. But they've been a real head case so far and I don't think we can take too much from the Kentucky game. The 2011 edition of UK is probably the worst SEC team I've seen in my lifetime (although I think 2003 MSU came pretty close). I can't see South Carolina beating Arkansas on the road, even if Connor Shaw continues to play well. So ironically enough, I think USC is depending on UGA to lose another conference game.
My pick right now would be Georgia, because the timing of the remainder of their schedule sets up nicely. They could end up 7-1 in conference play and still be a fairly middle-of-the-road team.