Unidenitified LEGO set
I don't think all the pieces are from one set. You have definitely got parts of the 8015 Assassin Droid Battle Pack in there (the grey and white tipped parts on the purple curved slope pieces are for sure from that set). 



But you seem to be missing most of the droids (only two droid bodies and a few arms, no heads). The two Star Wars figures are from another set - the one with the black hands appears to be minifig number sw201 - Clone Trooper Clone Wars, but since minifigs can be recombined this might not be correct. 



Both Stormtrooper minifigs seem to have the same torso (at least from what I can make out from the photo) but one of them has yellow hands - I cannot find such a stormtrooper on BrickLink nor a set that has both black AND yellow handed stormtroopers.

The cupola shaped bowl is from 8086 Droid Tri-Fighter (and the part is unique to this set). This is also likely where the chain of bricks on the top comes from - it forms the arch of the Tri-Fighter. The propeller-blades are part of the nose of this model.