David Lee + Andrew Bogut + either Biedrins or Jefferson gets you to where you need to be, if you don't take salary back. That's going to be VERY difficult to do though, because I think only ATL has enough cap space to take on either Bogut or Lee AND Biedrins or Jefferson, and they've already indicated that they aren't interested in Lee. (ATL rejected a Josh Smith S&T to the Warriors for Lee)
If Dwight has decided that he wants to play in GSW (big if that everyone is skimming over at this point), I think it ends up as Dwight for Barnes/Bogut/2014 #1 pick plus either another first rounder, or a guy like Ezeli, who becomes less valuable to the Dubs with Dwight in the fold.
Breaking:Report: TE Vance McDonald available via trade