I don't get all the Krstic hate... If the O'Neals and Krstic are healthy, BBD shouldn't play a minute at center, unless they are playing against Dwight Howard. Davis does a great work on D against him.
Krstic, Shaq and JO will share about 36-40 minutes at C, the distribution will be based on matchups, health and foul trouble. The rest should go to KG when Davis or (hopefully) Green are in the small-ball lineup.
Pierce will play more than 35 minutes every game, maybe 40. Ray Ray also more than 35, and Rondo probably 40. That leaves around 20 minutes for DWest. Green and Davis will play 18 minutes each.
Rondo (40) / West (

EDIT:

= 8 minutes
Ray (36) / West (12)
Pierce (39) / Green (9)
KG (25)/ BBD (18) / Green (5)
Shaq (15) / Krstic (12) / JO (12) / KG (9)
Wafer and Murphy get the occasional 5 minutes here and there, if any.
Arroyo, Sasha and finally Bradley are in street clothes.
I like the Celtic chances to win it all.