ive done white calipers before, dont do it! lol no matter how much you clear it they still become stained and look dingy. i think it may have been the chemicals i used to clean my car as well but i am not sure... gunmetal would be really nice!
gunmetal would be better than black, and more custom looking than silver. yeah..dont do red. maybe get colored lugnuts and make them match the color of those? i saw a red accord on v6p with stock brakes that were painted gold and they looked great..but then again your car is not red.