SAS rocks!
Hi-
First of all I should let you know I am a big fan of Big Eyes, Small Mouth from Guardians of Order, with that said, I like SAS d20, granted this game has no feats per say which has been a bone of contention on the d20 publishers board. Stand alone wise SAS kicks butt, jerry rigging it to d20 Star Wars or CoC really aint that hard, in SAS you get power points at certain levels to purchase new abilities, increase Ranks and so on, this can easily be interchanged with gaining a feat from say CoC or Star Wars instead of taking that power point increase. You can also look at the super abilities in SAS as perhaps bonus speciel abilities or feats them selves but it might be a pain as to how to work the rank system.
Just an Idea and personally, its most likely cheaper to purchase SAS then have to spend 30 bucks on ink to print out other TPM super hero games. Then again some might be able to steal from their school or work to thier copies printed(not very heroic IMHO)
Scott