I need some good fantasy advice

[Lucas Graham]

PPR 10-team league. 1 pt=10 yrds rushing. 6 pts =TD. 1pt=15 yrds rec. Return yards - 1pt=25 ret yrds

Heres my current roster:

starters:
Brees
Mike Wallace
Steve SMith (car)
Arian Foster
Antonio Gates
Cedric Benson

bench
Mario Manningham
Mike Williams (tb)
Lance Moore
Cam Newton

since Foster is hurt, I'm looking to possibly move Benson and another WR for a pretty good RB (perhaps McFaddenn, Forte, Hills, Turner?).... OR I could drop Lance Moore, and pickup a FA RB (top ones available are Darren Sproles and James Starks)