I would shop a RB around to get the best WR you can. I really like Welker, especially if it's a ppr league. But you want to make sure you get the best WR you can for a top RB like Gore. But I would definitely trade a RB to get a better WR.
12 Team League. We start 2 QBs and get .5 PPR, otherwise standard scoring
QBs: Stafford, Fitzpatrick, Collins
RBs: Charles, Mendenhall, Best, Starks, Carter, Karim
WRs: D. Jackson, Marshall, S. Smith, Green,
TE: Hernandez, Cook