Now that the team is shaping up, with the signing up of House and TA, I think this team would be completed by bringing in a gamble athletic and taller than Powe or Big Baby PF, such as Darius Miles (6'9 222lb) or Birdman Anderson (6'10 228lb). To finally cap it off, I like the idea of Stephon Marbury (6'2 205lb)as a back up pointgaurd/perimter scorer running the offense when Rondo is out or if Rondo gets banged up.
With that I think this would be a solid team, minus Posey and most likely minus P.J.Brown, compensated for in different but nice ways with a veteran (if he can prove he's not an idiot) to back up Rondo (who deserves the ball much more the S.Cassell did!!!) and truly run the secondary (and great insurance if Rondo is out with an injury); and Birdman/Miles would lack the smooth class of P.J.Brown - the ultimate vet - but they'd bring (if functioning at something of what they once were) an electricity even if eratic that as I say, won't equal, but I think will in it's own different way adequately compensate for the loss of P.J.Brown.
Of course - nothing can replace the CLUTCH that both Posey and Brown demonstrated in the Playoffs, but Marbury has shown some clutch in his career, and well - P.J. Brown's most CLUTCH role in the playoffs was solid blocking out and rebounding, even if his 'clutch shooting' got the notice, let's be realistic about how much he scored in the playoffs - not taking anything away from P.J., but he wasn't some monster scoring machine, he just hit the shot when he needed to on the biggest stage - there is no reason to suggest someone else can't make up for the loss of PJ offensively - he wasn't the center of the offense ever, he just got the ball on rotation and put it in - same as Posey. I don't think Marbury has proven to be clutch as Posey has - but has Marbury ever been on the BIG STAGE and had the chance? He's in the regular season his some clutch shots in his career.