Joost is right. Forget yellow. Red might be fun (check canadian driver article) but I think there's a danger of being fun for a while and then it gets to bee too much.
Black doesnt underline the shape of the car and easily looks dirty.
Silver is always nice, but perhaps too conservative (mine is silver...) but like Joost says Atlas grey or my favourite SEAL GREY! It is absolutely stunning.
Ill see if I can find a picture of one. I think one of the guys in here has one in that color.

Välkommen til rennteam forövrigt
(Ja, även här finns det jävla danskar...hehe)