Who to drop for Stevan Ridley?

[gtiguy2006]

QB: Big Ben, Freeman
RB: McCoy, S-Jax, Felix, Starks, M. Bush
WR: Megatron, Welker, V-Jax, L. Moore, Manningham
TE: WItten, Olsen
D: 49ers
K: Kasay

Who should I drop (if anyone) for Steven Ridley? I would like to pick him up early while I can in case he blows up even more than he already has.

Any thoughts? PPR SCORING