The big coaching names I currently see that are not at big programs already would be -
Peterson - won't leave BSU because of his son, just ask UCLA
Gruden - how did our last NFL coach work out? Also, why would he leave his gig at ESPN?
Cowher - severely doubt he leaves CBS, otherwise why wouldn't he be coaching an NFL team already
Mike Bellotti - Does he really want to come back to coaching though?
Ferentz - Can't recruit and probably will never leave Iowa
Saban, Miles, Kelly, Kiffin & Meyer are already taken.
Troy Calhoun may be a good hire, but I wouldn't consider him elite and I'm not even sure he'd leave Air Force. He didn't for Tennessee...
Our other wishful thinking options could include Patterson (who probably won't leave TCU), Briles, Mullen (why would he leave the SEC?), Fitzgerald (but we won't take another coach from the Big Ten probably & he might not leave Northwestern anyways) and Gundy (won't leave OSU).
There are some big name coordinators out there with no head coaching experience, but hiring one of them would be an awful lot like hiring Bo.
Am I missing anyone?