At this point, I would continue to sit Tony and play the rest of the guys against SAC to at least lock up the #2 seed. After that, I would leave at least Duncan and Parker at home for the 2 game road b2b (@LAL, @GS). Make sure Tony is healthy for the playoffs and give Tim some extra rest for the playoffs. After that 2 game road trip I would then play everybody who is healthy enough to play in the home game vs MIN to give the team 1 warm-up game before the playoffs start.
This whole "build momentum" crap is re ed. The Spurs aren't going to build any momentum if Manu and Diaw are still out. Might as well sit everyone and make sure they are healthy at this point.
It's definitely not an ideal situation to be in going into the playoffs but the Spurs were dealt a hand with injuries down the stretch. Hopefully they can play the whole team (Tony, Manu, Diaw, everyone) in that home finale against MIN and let some of the guys knock off some rust before the playoffs.
I say shut down Tony until the MIN game and then shutdown Duncan until the MIN game after Friday.