I would actually consider the Big Ten as the best conference with the Big East not far behind it. Some have argued that the Big Ten really isn't that good, but they have a lot of top tier teams that can beat anyone on any given day: Mich State, Wisconsin, Purdue, Ohio State. From top-to-bottom it is pretty good. The Big East, though, has a few really great teams, some good teams, and then it really drops (although USF on their hot streak may disprove this).
I think the third best is the Big 12. Kansas, KS, and Texas are all good (with Kansas being borderline great). Each could go really far in the tourney. But after these teams, it really drops off.
After that, it really drops off. The ACC is probably fourth, although you can argue that the SEC is just as good (I hear readers clicking 'Reply' to this statement
). The ACC is competitive within itself, but we have been pretty lousy against other BCS conferences.
And, lastly, to answer your question, our Blue Devils beat UCONN!