Gold comes to mind for me too. But the next question becomes what color for the wheels, will you be OK with them or feel compelled to do them next?
In my experience powder coated wheels, even done by a reputable shop, just don't hold up as well as the original finish. I'd suggest choosing a caliper color that will match the wheels you have (or that you plan to buy).
Gold may be that color, but keep the wheels in mind.
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