Pretenders:
Any team in the Big 10 or SEC not named Tennessee , they just don't have total packages like some of the better teams in the country. I will give the advantage to Wisonsin, at some point the media/public has got to recognize how good of a coach Bo Ryan really is with what he has been able to do without any legit NBA prospects.
Marquette, Connecticut, Vandy, K state, Notre Dame, Texas, Tx a&m, : too sporadic
Contenders:
Dook: Pains me to say, but the way they go on 10-0 runs to put a close game away is rivaled only by Tennessee or Memphis.
Memphis: they win, and Derrick Rose may be the player to push this team to the title game
Tennessee: they really are simply kicking the living piss out of every opponent right now (even with the close LSU game), how are they not a contender
UCLA: Ben Howland knows how to coach big games and they have great players at every position and great role players
Georgetown: they have the total package, but can they play tough enough on the boards to win 6 games in a row
Kansas: can beat anybody, any day if they play well enough, question is will they?
UNC, just because they dont play any defense doesnt mean they cant outscore everyone 6 games in a row
Close to bottom or Not in top 25 legit threats to outperfom:
Louisville, Maryland, Pitt, Stanford