There are flashier names (DeAngelo Williams, Ahmad Bradshaw) who have the speed and big-play ability Miami covets, but there is another running back who could be the next Michael Turner. If you remember, Turner was the backup to LT in San Diego three seasons ago, and was considered one of the top back-up RB, and next-in-line players. Atlanta invested in him and the rest is history. Oakland's Michael Bush could be the same situation.
Like Turner, Bush is very compact (6'1 245 compared to Turner's 5'11, 244), and has the size to be a feature back. He's your classic between-the-tackles runner, who offers play-catching ability, and can make big gains. With all the potential running backs out there, it'll help keep the market down, but Bush is an under-the-radar type, and at only 26 years old, with very little tread used (376 career carries), he offers a lot of intrigue.
Give me a Orton, Bush, Mankins off-season and I think we have ourselves a playoff contender.