PFF has a good feature on the best remaining free agents available. This is who they have ranked for RB. If he is healthy, he's a serious upgrade from spindenhall.
Running Back: Ahmad Bradshaw (+14.2)
Bradshaw is arguably the most complete running back in the league, but chronic foot injuries make him a bigger risk than most other 27-year-old free agents. A reliable pass protector who’s allowed just three quarterback sacks since 2008, Bradshaw has ranked in the top 10 of our running back grades in each of the last three seasons. Honorable Mentions: Michael Turner, Cedric Benson