My Cayman S was black...and despite loving the car, it being black was a nightmare. For the 30-45 seconds that it was clean....it looked amazing, but after that you saw ever spec of dirt and dust that landed on it. Within what felt like 5 minutes, it was just as dirty as it was before it was washed. When I first got the car, I was washing it every other day.....but I got tired of it and swore I'd never own another black car.
My incoming M3P is white. Somewhere along the line (before I owned the Cayman), I determined that I loved the look of a white car with black trim. Looks amazing.....and light colored cars don't show general dirt as much as darker cars do. They also don't show nicks in the paint as much (hey..industry standard white primer....) which always pissed me off! My first Z was blue...and while I loved that color so much, it showed nicks like turning on a flashlight at night.