The best looking ones I've seen have been the black over pearl. (it's what I've got but unlike the other colors, it costs a lot more to repaint. It takes 3 coats of paint plus the clear coat to get that irridescent ? shine to it (the opposite of metallic since this is where the light reflects back in the direction it came from).

What I think would look absolutely cool is a black over yellow. Might want to photochop that and see how it looks.