To answer the OP question I don't think I would out and out hate any of the names that are being thrown around.
However I would be concerned to varying degrees.
Most Concerned A: Andy Reid - I'm glad it doesn't appear the Bills are hiring Reid. this Dude needs to take a couple years off. Didn't he have two sons die? His family life is all F-ed up. He needs to go rest and recuperatie with a therapist. I would just expect to have a mental breakdown at some point.
Most Concerned B: Ken Wheisenhunt - It was nice to have Kurt Warner. Kurt Warner ain't coming to Buffalo so whatcha going to Ken? Oh, create another QB debacle. (Also if Ken Whisenhunt goes elsewhere outside of Buffalo I would say that Chan Gailey would be high on his list as OC. So who would his OC be if he goes to Buffalo.
Second Most Concerned: Lovie Smith - I hate hate hate "system" guys. To paraphrase Wade Philips, Wade said its the job of the coach to take the talent you have and make it work. Not make the talent you have do something it may not be capable of doing. Coach the players and adapt the system not the other way around. I think he could get an OC though.
Then you have the unprovens in order of concern:
Mike McCoy - Peyton Manning's OC? Yeah thats a tough job. Right up there with practice Squad QB for the San Diego Chargers. Surf, bang hotties, show up to practice, surf, bang hotties, sell good tix to the game. Peyton "Hey OC don't get in my way" Mike McCoy" Yes sir"
Ray Horton: - I love what he did on the defensive side of the ball in AZ. Even when they were crap there defense was a unit you generally didn't want to play. They got run down in the 4th because they basically had the University of Phoenix Offense going 3 and out on every possession. Who would he get to be the OC? Some QB coach from Pittsburgh. Would he be able to hire an experienced hire at OC? Those are major areas of concern.
Chip Kelly: - CJ Spiller and TJ Graham in the back field (because why would you have Graham run routes with that speed. Just do some crazy flip the ball to TJ Graham screen plays) Would be crazy interesting to watch. Could be a huge disaster as the NFL LBs are all teh fastest dudes on all of the college teams. You can pinpoint your attach against the EEE major at Stanford, everyone is a college all star LB. So they can track down those plays. It would either be a Boom and unstopable or be a bust and laughable; No in between. Plus Chip Kelly appears to have some Iron Gonads. I don't see him punting from INSIDE THE OPPONENTS 40!!!
So I guess I would most like Chip Kelly but I wouldn't hate any of the above outright.