Andrei Kirilenko would be my top FA target with the MLE.
Go all out in a run and gun offense with terrific quickness and length from Garnett (C) and Kirilenko (PF) to protect the paint defensively with Rondo and Bradley doing there on the perimeter. Pierce plugging the holes on each end.
Try to keep Bass, Stiemsma (backup C), Wilcox (third string C), Jeff Green (SF/PF), Pietrus (SG/SF) and Dooling (PG) to fill out the bench. Look to replace Marquis with a shooter/defender. Probably can't upgrade Dooling if MLE is spent on Kirilenko, oh well. Bring in Joey Dorsey as a rebounder/rebounder PF (third string PF, alternative to Bass) off the bench.
I wonder if that bench is better off without Ray. Lots more quickness and activity without him there. I think the team needs that. I hate to lose Ray's shooting and scoring. Anyway, probably miss out on one of Green/Pietrus so bring Ray back in that case.
C - Garnett, Stiemsma, Wilcox
PF - Kirilenko, Bass, Dorsey, JJJ
SF - Pierce, Green, (shooter/defender)
SG - Bradley, Pietrus/Ray
PG - Rondo, Dooling
I think that is a pretty nasty team. I'd be very happy to see that next season.