I'd wait on this since you are good at WR already. I know Foster is gimpy and could be all year but if he gets better that is gonna be huge for you and you can't afford to trade away RB depth right now. Starks will be okay but Foster can be a stud even though he'll be in a timeshare when healthy at least some of the time. Look at schedules and see if you can sneak someone like Chris Johnson for him. If no luck sit tight with him. You can never have enough good RB's with injuries as you can see. Check my Vick Question.