i have a white 986 and have these rims:
http://www.rh-wheels.com/index.cfm?P=wheels_detail&PID=84680
i'm gonna powdercoat them black with polished lip... will post pics when i get it done, hopefully within the week.
white on white rims.. ehhhh nah. i saw a z4 like that the other day and it just felt the car was downgraded. as for black rims with polished lip, i think it looks good on exotics and tires that aren't too thick. and hell, if versace and lamborghini (
http://www.hypebeast.com/2006/11/lamborghini-x-versace-murcielago/) say its a good combo, i believe them