I'd probably do something like this
UTA - Rondo, Terry, Green, Barbosa (for salary)
BOS - Jefferson, Mar. Williams, Burks, Watson/Foye
Marvin Williams and Jeff Green are fairly identical players, but Williams has 2 less years on his contract. Jefferson is a monster down low, pushes KG back to PF, which helps the team immensely. Burks has shown promise as a young PG prospect and then you add Watson (or Foye) for depth. Trade also adds 2 active players to the roster to greatly help with the depth
Boston seems like it is closer to a title this year and has a lot more long term flexibility by shortening or removing long contracts for shorter/smaller ones.
PG - Bradley, Burks, Watson
SG - Lee, Bradley
SF - Pierce, Williams
PF - Garnett, Bass, Williams
C - Jefferson, Garnett, Wilcox, Melo