I think Brian Kelly is an interesting coach to look at. Overall he's 273-96 which is about 74% winning percentage. He owned D2 obviously but his record at Notre Dame has been solid. I obviously think that the SEC is a much different league, but he has gone 101-39 at ND. I'm not all in on Kelly, but I can see where other than his age (59) he'd be desirable.
Mark Stoops is 49-50 at Kentucky, a great record for that school for sure, but he has not been consistent. That's a pretty hard sell imho.
Kiffin is 66-39 overall. He had a 67% winning record at FAU of all places, he's by far the best coach in their history. They had gone 3-9 the three previous seasons.
Urban Meyer remains as one of the greatest coaches in College Football history. He is 7th ALL TIME in winning percentage regardless of division at 85.3%. For reference General Neyland was 82.9%, Dabo is 80.9%, Bob Stoops was 79.8%, Nick Saban 79.7%, Chris Peterson 79.5%.