I think it all depends on the matchups.
First of all, Bradley sits automatically. I'm almost all set with Murphy too unless J.O. is hurt. Murph is horrible at D. So that's two I would sit. Then it's down to Von vs Pavlovic.
Chicago has doesn't have a great 2 guard so you would need more offense/spacing. Wouldn't need Sasha's D as much so I would go with Von.
Against Miami I think you would need all the wings you could get so you might sit Arroyo and have Sasha and Von available. But I would definitely want Sasha around as an extra guy to throw at Lebron and Wade. I don't think Von scares them at all.
I'd probably go with the same strategy against Orlando too. I'd rather have Pavlovic as a guy to throw on Turk or J Rich just because he's a little bigger than Von and those guys are decent post up guards.
Against L.A. I'd sit Arroyo along with Murphy and Bradley since you won't need anyone to stop Fisher. Von and Pavlovic can help Ray if he gets in foul trouble (although I'd prefer Paul at the 2 and Green at the 3)
The actual rotations I'd like to see:
Rondo/Delonte
Ray/Paul
Paul/Green
KG/BBD
Shaq/Krstic or J.O.(depending on offense/defense matchups)