Space gray but only because I like darker colors. Mine is Black sahpire, and it is true as most pointed out it hides 335IS details.
If you go with SG, get two tone light interior. Black interior will get old soon! Mine is Oyster/Balck, and it really brightens up the interior.
With AW Brown/Black interior looks incredible..
2011 e92 335is DCT
2006 e90 330i 132k miles SOLD!