Personally, I think the Challenger, no matter what color, needs stripes of some kind. It's just too much car to NOT break up the color somehow (which is why I have the RidgerGraphix rocker-pannel stripe with the word "Challenger" cut out in script on the side). For a black car, I'd DEFINITELY go with silver for the contrast. But then, I've never liked wearing ties the same color as my shirts.