i had the same dilemma, and settled with z5000 i think they're called...i know some of yall say they're common, but not where i live...anyways, they're silver, cause the gunmetal on black sometimes looks really dirty cause of the offset in color...
what i'm going to do (one day) is wetsand the rims except for the lip, and paint them jet black and polish the lip. it would look SO nice to do that. So yea, if you want a matching scheme, find a BLACK rim, and try to stay away from gunmetal unless it just looks totally sick with it