Prefer Spiller over Bush but I'd take it, would rather have Harvin.
I want Harvin's talent any basically anyone elses reliability, does that exist?
I also have mixed feelings on Harvin being as much as a headcase as we all think he is.
He wasn't exactly shipped off from Minnesota, Seattle paid a kings ransom, and it only seems like he had major issues with a small number of players in the locker room which may have been issues too big to contain, if I remember correctly, he had quite a bit of support after being shipped away from players who were surprised and upset.
The Jets tried to make him their #1 in a system he didn't know with one of the leagues worst QB situations while making top tier WR money.
He was only really shipped off from one team for not meshing with a few players, not everyone is made to get along.
All of that said, Harvin is not an RB, I'd love Bush AND Harvin, or Spiller AND Harvin, but Harvin does not fill the 3rd down RB role exclusively.