I just finished washing and waxing my black 370z today myself... Looked damn fine when I was done... for about 30 seconds until a stray blade of grass from a cut lawn landed on it lol.

I must admit, I only have a black z because it was the only one available around here for the next 6 weeks when I got it, and the dealer gave me what was then an incredible deal at invoice. I love black, but the 370Z's black is weak compared to many other car pigments out there. It just gives off a weird shine that makes it appear kind of purple/brownish, depending on the light and if there's moister. This is a minor gripe, and isn't noticable unless other black cars are present, however. It just so happens my roommate's accord is black... lol