I think Louisville is going to be the next one. In fact, it's already started as far as I'm concerned. It has Pitino, it has heartbreaking losses on both sides, and players to hate (Kyle Kuric, Peyton Siva, Russ Smith, anyone?). It doesn't have nearly the same 'hate' factor as the GTown rivalry, but give it time. It's blue collar rust belt against wine and cheese derby folks after all.
I have a ton of respect for the Louisville program, and I threw in my lot in with their fans at the Georgia Dome...but it doesn't mean i have to like them.
Oh, it will be the new healthy rivalry of the ACC.