I would hang on to McGahee if possible. If you could get him to bite on either of those receivers with Mathews I would take it for sure. I have a feeling you might have I bump it up to McGahee or Forte though...
12-Team Standard (Start 1 QB, 2 RB, 2 WR, 1 W/R/T, 1 TE, 1 K, 1 D/ST)
QB - Cutler, Pryor
RB - Forte, Gore, Mathews, D.Richardson
WR - White, Colston, Nelson, Shorts, Edelman, M.Brown
TE - Cameron
K - Bullock
D/ST - Streaming