I've been pondering what color to paint my 68 fastback as well. It was originally burgundy metallic with a white bucket seat interior.
Because this is a going to be a barely street legal low budget tuner tuning machine, I'm toying with the idea of flat black with flat black reflective rocker panel stripes and all the brightwork polished and shiny and a set of steel wheels/poverty caps. I wouldn't have to invest a king's ransom in bodywork, it'd be easy to maintain, and the stripes would look cool at night in the lights.