Id look at the other owners rosters and see who is weak at WR and check out there RB's. With your roster I think you will have give up Harvin for a good RB1. Some of the RB's I would target are Gore,Charles, Lynch, Richardson, Morris, McCoy. Some might reject the offer but its always worth a shot. BTW who was your 1st and 2nd pick, because I dont really see and top 2 drath picks on your a roster for a 10 man league.
10Man Standard Scoring
RB-ADRIAN PETERSON, Fred Jackson, Reggie Bush, Chris Johnson, Maurice Jones-Drew, Ahmad Bradshaw
WR-CALVIN JOHNSON, MIKE WALLACE, Roddy White, Denarius Moore
TE-VERNON DAVIS, Owen Daniels