Gotta agree with KD, and the reasoning can't be explained better. Not even close on that deal.
Consider adding a John Kuhn, Lagarette(sp) Blount of TB or a BenJarvus Green-Ellis. Guys who aren't getting a whole lot of attention right now, but will get goal line carries and have a chance to see their role expand. Blount being my favorite of the three.
If Torain or Bush are there, those are must-adds. Donald Brown is another guy out there who can help someone a whole lot down the road. Chris Ivory may have some value filling in in the short-term. Good luck!