I think you're making a huge mistake by going with the darker colors. As an artist I can tell you that the M3 has unlike most cars has most of it's charachter in it's from, meaning the bulges and sublte folds in the body. You aren't able to see that with a darker color. There's just a huge majority of people who will agree that the M3 doesn't look good in lighter colors, and almost everyone in the know thinks so, I've spent 3 months researching the car and seen every color and option in person and even the salespeople agree by a wide margin the lighter colors look better so overall I think it's a huge mistake to get an M3 in a darker color, and especially to spend money and go out of your way to get it in that darker color.
Clean cars are happy cars!