I think Bush is going to be one of the most interesting players to track this offseason. He has potential to be a very good lead back for a team. From what I've seen, I think he could easily be a 3 down back. But that doesn't mean a team has to have a dire need a RB to sign him. These days, teams pay top dollar for a RBBC.
Anyhow, these are the landing spots I see as most likely:
Oakland - he's bound to have grown some roots here. He's been here for a long time. Plus, the team actually looks capable this year. Maybe he has bought into the team and believe he can win a championship here. But I'm sure he doesn't like playing second fiddle. Al Davis is playing with Monopoly money, though, so I won't be surprised if he makes Bush an offer he can't refuse.
Denver - it looks like Moreno is on his way out and McGahee hasn't exactly been lighting it up. It seems to me like Bush would be a good John Fox type of RB. Stephen Davis-esque.
Cincy - Benson is not the answer and they don't seem to like Scott for whatever reason. They will be looking to upgrade the position this offseason and Bush is a great candidate.
Dallas - Felix is always hurt. Choice just hasn't been able to step up. Murray is a 3rd down back. They will be in the market for a starter.
Detroit - Bush would fill the LeShoure role well and players just don't come back well from achilles injuries.
Atlanta - They can't go into 2012 planning to lean on Turner again. I'm not saying he's done, but that team is in win now mode and it would be foolish to put all their eggs in the Turner basket.
St.Louis - Bush would fill in nicely for SJax. I love watching SJax play, but they've got to be considering hedging their bets there with all his mileage and injuries.
49ers - I know Gore just got a decent contract, but if he can't finish this season then they have to start looking for a replacement or at least a tandem piece. Also depends on how they feel about Hunter/Dixon. Plus, it has to be geographically appealing to Bush if he enjoys the bay area.
These are fine teams and all but Bush wants to be a lead back.Unless something happens in Oakland with Mcfadden or he cant find a spot where he will be the starter he will not be resigning there. Even then I dont see him staying there.
St Louis, Atlanta, again a backup. Maybe their RB's are old and near the end of their careers but Bush wont go there unless he is the starter.
Dallas, Im pretty sure with what murray has done calling him a 3rd down Back is a mistake. Either way with murray/felix I dont see him going there.
SF not seeing it again a crowded backfield. I think they like what they have there.
That leaves Cincy/Seattle/detroit (if best doesnt come back) on your list. Those are possibilities.
One team I would add..... Cleveland. If they decide not to resign Hillis I would think Bush would fit in real nicey there.