tiny little sliding calipers are never cool... so black or silver are my votes. get some big 4 or 6 pots and go exotic on color to show them off!

I wouldn't advise white, they'll get dirty once and never look good again.

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2006 Audi A3 2.0t DSG apr stage 2
2002 BMW X5 4.4
1997 BMW 328ic sport. moreagrun metallic
1989 BMW 325is with / M50b25nv swap