don't forget the ds emulators, those are pretty much perfect too, specially no$gba, the developer claims its for production use of nintendo ds tittles and even goes as far as bashing pirates in some menu (forgot what part) of the emulator but the "no$" part really makes him sound like a hypocrite.
My Specs: AMD Phenom II x4 940 3.0ghz - w7/Ubuntu 11.04