What to do with Braylon Edwards & Willis Mgahee ?

I drafted Braylon and Colston in my top 5 & was wondering if I should continue to start Edwards or play the guessing game and rotate Marvin Harrison,Antonio Bryant, Vincent Jackson, or Kevin Walter- I wonder if Edwards & Colston might come up big again come playoff time ? And do you believe that Ricky Williams is a good trade for Mcgahee ? Or do I hold on to Mgahee for awhile longer ?