Answer Guys: Get full value for fantasy star

In a standard league, my WRs haven't been producing enough for me, Marvin Harrison and Wes Welker in particular. I have serious concerns about their fantasy viability based on the first few weeks. Currently, Cotchery is my best wide receiver. At running back, I have Adrian Peterson and Maurice Jones-Drew, but my flex spot is usually occupied by LenDale White, who is a sinking ship. In short, I need depth and have decided to use my best chip in Peterson to make a trade. I've been offered Hines Ward and Jonathan Stewart for Peterson. Should I make the deal?
Mike Zabel