I agree Anton, and think the #41's the best sculpt to use (even with the slot in the back... Hell just include packs for them even, even if not from the films... it just makes the figure more fun and a nice new/different accessory).
I think the heads are the only thing to resculpt, unless there's an armor difference, at this point. The AT-TE Gunner could even be reused to make a new Clone riding the BARC's (Neyo's group) or something. I think Hasbro nailed the sculpt the first time around pretty good though... So for Utapau grunts, or Coruscant, or most any variant of the Clone, the SA Body works pretty good. Only the Commanders, and a few of the more specialized Clones would need a whole new sculpt (Gree's men on Kashyyk, obviously, would require a new sculpt, but hell, reuse it for a ROTJ Biker Scout!).