definitly a sweet color....Red would also be a good choice but if you painting it then go for a color you wont see on future e70 models. I bet money that BMW will come out with something like the Imola Red or similiar. IMO i would choose a light evergreen color so it stands out alot more than a dark color.

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear