For me, my first choice is black with silver rims, followed by white with dark gray rims, or possibly brown with silver rims.
Brown = Intelligent, sharp, sophisticated, maybe just a bit older, definitely original.
But I'm leaning to black.
I just imagine my wife and I going out on the town... and is there really any other color than black to do that in style?
I'm not worried about keeping it clean, that's what dust mops for cars are for, and it will be a joy to pamper.
I do worry about black being a bit flat though, where the metallics give you depth and different kind of richness.