I'd say maybe balloon the idea to include Ray. If Minnesota swaps #5 and #6 (or #18, don't know if Memphis wants back to back top ten picks with their financial state) to the Grizzlies for #2, as I somewhat expect, maybe this could be a way for us to snake a good draft pick out of Memphis. Take Scal out of the equation, since that would mess up the salaries. Put Ray on the table with Rondo and Giddens, and take back two of their contracts, Jaric and Milicic, with Conley and Gay. Along with their 18th pick, or maybe 5th/6th (whichever they would keep) depending on how eager they are to move two bad contracts and take back a big expiring. Again, this is all dependent on the painfully-sensical scenario of Minny flipping two of their first three picks to Memphis for #2 and the chance to draft Rubio, happening first.
It would look like this, http://games.espn.go.com/nba/tradeMachine?tradeId=lytm7m
Celtics
PG - Conley/... (FA?)
SG - Gay/Jaric
SF - Pierce/Walker
PF - Garnett/Davis
C - Perkins/Milicic (also doubles as maybe somewhat useful size behind Perk)