I'll tell ya why to cheer for Michigan, if they win Illinois basically controls their own destiny for the Big Ten regular season championship because they won the only meeting they had with Mich. St.
Also, if you're a big ten fan, Michigan needs a win bad to help their tournament chances. I think that State has already secured a spot.
Right now I see Illinois, Wisconsin, and Michigan State as locks. Michigan has the best chance of the rest. The only way the big ten gets 5 teams is if IU or Purdue or anyone else not mentioned above wins the conference tournament, and even then they make take away Michigan's bid for one of those teams.