congrats... mods are a personal choice IMO... if you like something on your car then go for it... Performance I would do a drop in filter, pulley, full exhaust... minor stuff like that. Powder coated wheels really depends on what wheels it is. The carbon ifber hood thing really doesn't make much sense on the M3 unless it would look different from stock because the factory hood is one of the lightest hoods around.
oo and hurry up with those pics