Wisconsin - had a rough stretch but I think they're right up there with MSU as the top team in the Big 10. Wins against Florida, Michigan, MSU, St Louis, and Iowa home and away, should be ranked much much higher right now imo.
MSU - Izzo. that is all.
Iowa State - long shot, but being led by a senior guard is always a big plus in the tourney, and Deandre Kane has been great this year. They're the only team to score at least 70 in every game this season so they can hang with any one. They just don't have much size at all, nobody who plays any real minutes is over 6'7", so a team with a true rim protector can cause them some issues
As UofAZ420 said, Wisconsin had a rough stretch there for a few weeks but I'm really high on them. I actually think they're more dangerous come tournament time than MSU. I'm sure I'm one of the very few who think that but I'm very high on this Wisconsin team. Also, as much as it pains me to say it as an OSU student, I think Michigan could surprise some teams and make another deep run. They're not as talented as last year but they're still a dangerous team.