OH BOY!!!! You just didn't ask about CUTTING THE STOCK SPRINGS DID YOU? NEVER CUT the stock springs on anything, I don't care if its a Geo or an NSX! When you cut them you change the spring rate and your car will be bouncing like a low rider in a rap video!
I think the lowest drop that I've seen is 1.5 inches for springs. If you want more drop you can get coilovers that are adjustable from 0 to 3 inches. Ground Control, H&R, Comptech, Dahi Raing make them for the NSX.