My vote was no stickers but black is my second choice. I like the sl stickers better than the original te37 decals that endless suggested. My te37's came with the original decals and I quickly removed them.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust