First off: Good luck to you Mr. Posey, and thanks for everything. Hope to see you on the other bench when the C's make the Finals next year.
Now, the Celtics need a PG and a Center, plus some offense off the bench. The Celtics next season do not need to be an exact carbon copy of this season to win. So... Maybe we resign TA, and start him. He plays MUCH better as a starter, and then we bring Ray off of the bench for scoring.
Also, get Ty Lue, or Steph Marbury. They both fit with this squad, and should be pretty cheap. Lue is a better PG, and we need a PG. Anyone else remember House trying to bring the ball up against Lyndsay Hunter. Marbury is talented, has someting to prove, and pretty young. I think he could really help this squad. His persona is hit & miss - I still like his cheap bball shoe for those who can't afford Air Jordans. Remember Steph had his best time alongside KG in 'Sota, and he really only fell off when Isiah came into the picture.
Sign Matt Barnes. He's a scappy guy, and can help if the rooks need more seasoning.
Then for another big (maybe O'Bryant will work out, maybe he won't- best hedge our bets with another big) sign either Melvin Ely or Primoz Brezec. Ely, when he gets minutes, can play and take up some space. Brezec is soft (shocking for a Euro not named Drazen), but can hit the PJ Brown 14 footer.
I think the Cs can do this all with the $$$$ they have left.
Our bench (if Ray Allen starts over TA) is
Ty Lue or Starbury
TA (or sub Ray in here, and TA as a starter)
Matt Barnes
Leon Powe/Big Baby
Melvin Ely or Primoz Brezec
Add this to our returning squad, and we are on our way to the ECF, with a shot at #18!!!