Butch
Richt - as others have mentioned, just not sure he has the necessary passion for it.
Mullen - don't like his offense at UM, especially the need for a defensive end-sized beast to play QB. Has had way too much talent on his defense for the numbers MSU has given up. He's not bad, but I would not be excited.
Schiano - Rutgers played a very weak schedule during his supposed success there. would take him as a DC in a second