He is very highly respected. Teams more prestigious than ya'll (that's not smack talk, just an observation) have tried to hire Bumpas and failed. Miles will get another year and so will Chavis, if that does blow up, he might be an option. Fowler is close to Johnson, I'm not sure he would leave. It would make zero sense for Nix to leave Ole Miss for State. It's a lateral move and he is coaching for a proven guy in Oxford. Like it or not, Mullen is still not proven. The only way to attract hot names with unproven coaches is with money. If you pay Nix to leave Ole Miss, you are going to have to pull that money out of other assistances current salaries. That isn't going to go over well.
Brick Haley could be a good choice. He has never been a DC before, but he is a hell of a recruiter. It would be a gamble, but it could work out on both ends. Even if he can't coach, he is still going to pull you guys some players.