Right now, I would put it like this:
Rondo/Nate
Allen/West
Pierce/Daniels
KG/Davis
JO/Shaq
But Wafer could sneak his way in there, as could Bradley. West also could end up playing more PG. JO and Shaq could switch.
I think there is going to be some real competition for the backup spots on the perimeter, and I expect that to continue for much of the season, with different guys getting looks.
I think Doc will go a lot with a 10 man rotation early in the season, and the guys who end up on the outside looking in could be swung at the deadline for a stronger backup SF (or to fill another hole created by injuries).
edit: Roy beat me to it.