I think one thing we should realize is that come playoff time, there isn't going to be a "second unit." There will be a 8-9 man rotation. Thus, it won't be Marbury, Eddie House, and Tony Allen, it will be 2 of the 3. And it will likely be one big man playing the bulk of Perk's backup minutes with one other one getting spot minutes backing up Garnett.
If Marbury works out and TA gets healthy, I think House sees less than 5 mpg come playoff time. I like his shooting, but he can't run a team, can't create his own shot, and can't guard big guards.
As for the big me, I think Baby has the edge over Powe. Moore's an energy player like Powe, but 5 inches taller. Davis fits the bill with muscle.
My playoff rotation if all goes well:
Starting 5:
Perk
KG
PP
Allen
Rondo
Rotation:
Marbury
Moore
TA
Big Baby
End of bench:
House
Powe
Scal