I go rebuilt calipers from autozone, they had the nissan lettering still on them. Just a word of advice, make sure to get twin turbo calipers that were not on the later year models (whenever they switched to iron) I ordered calipers from a '95, and sure enough, they were iron. not that iron's bad, but they are kinda heavy.
http://importnut.net/300zxbrakeswap.htmthat link should have everything you ever wanted to know about the swap. helped me get my full swap done in no time at all (minus the ebrake, that was from hell)