If we can't get Patterson or Peterson, and I doubt we can, get Kelly or Kiffin. I'm not sold on Kelly because I think Tennessee would be just a job to him. He is worth serious pursuit--but is he a fit? Kelly had the good stretch at Oregon but that could have been a one-off: he had a great QB; there is not a lot of recruiting competition in the Northwest. Say what you want about Jones, but he loves the Vols--and that is a great quality to have in a coach.
Kiffin would want to redeem himself for Tennessee fans, IMO. Kiffin can coach QBs and offense, and he knows both the SEC and Tennessee VERY WELL. That is important, in my view. Both he and Kelly would surely do well recruiting.
After those four maybe Petrino, but has best years may be behind him. That is certainly true of Miles.
Coordinators are a roll of the dice. You might hit a 7 or you might get snake eyes. Better to go with a guy who's been a head coach.
Peterson/Patterson
Kiffin/Kelly