Cinderella? Winthrop, perhaps?

So, based on last night's conference tournament outcomes, we now know that Davidson, Penn and Belmont have made it into the NCAA tournament.  Realistically though, can any of the soon-to-be 14, 15 or 16 seeds really pull off the unthinkable by making the Final Four?  It's highly doubtful considering that 95% of the time these seeds will lose in the first round.  So, with that in mind, where will this year's Cinderella come from?  My thought is that it will be a 12 seed that beats a 5 seed in the first round.  Last year A&M beat Syracuse as a 12 seed, but you really can't consider a school with 45,000 students and deep pockets to be considered a Cinderella.  If I recall correctly, George Mason was an 11 seed last year and that may have been a record for the lowest seed to make it to the Final Four.  At this point, I'm not sure where Winthrop will be seeded, but they appear to be the most obvious candidate for the Cinderella role.  Winthrop beat Missouri State and Mississippi State this year.  Both of these wins were against quality opponents.  I think we'll have to consider Davidson as well as a potential Cinderella.  How about Xavier? Currently, I have them ranked 43 with quality wins over Villanova and Illinois.