Bit of a thread resurrection, but I've just had mine done from silver to black with a touch of silver flake - to match the nero carbonio paintwork. They look absolutely stunning! Agree with the gloss black - they can look cheap, but all you need to make them look just right is a touch of metallic IMO. Looks way more modern and really highlights the calipers. Silver just looked a bit busy and dated I felt. Photos don't do it justice.
Before and after (can't really see the metallic effect but looks awesome in person) the chap did an excellent job of matching the bodywork:
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I've got a set of black centre caps with silver tridents and some chrome black nut covers so will be putting them on once I've had the wheels re-balanced.