Obviously you've identified your relative strengths (WR, TE) vs. your relative weakness (RB2, QB).
Chris Johnson may just cost you too much. If I am the CJ owner I probably want AJ, Stewart, and maybe Shonn Greene. That's pretty salty.
I'm not sure you help yourself by giving up a WR to get Dwill since you already have Stewart. The payoff is beyond 2010 when CAR likely needs to get rid of one, giving you 2 probable starting RBs... but I don't like to look that far out, too many things can happen.
I guess it kinda depends on what you think of Forte going forward. If you believe in buy-low sell-high, he's a great candidate as Da Bears (and Forte) stunk this year. He could be a serviceable RB2 in 2010 as you wait on Greene (and Jones to retire/move on) and Stewart to assume workhorse roles.
I like P. Thomas as no more than a RB3 going forward.
I also think you need to upgrade at QB. ATL is a run-first offense, so I don't see Ryan as any more than a low-end QB1 at best. Smith and Young have moments but are too inconsistent to start on a regular basis. Maybe you could dangle a young RB for a Roethlisberger/McNabb type of guy.
I like your array of young RB talent, so I don't think it's absolute you have to keep the 1.2 rookie pick... maybe dangle that to a team with aging vets and get some help at RB2 and/or QB1.