Definitely go all black. I'm planning to do the same in the future.
If you want everything CF hit up LTMW and order the duke dynamics performance diffuser.
M3 Edition Grilles|Painted Reflectors|Matte Black Vinyl Window Trim|M3 Lip Spoiler|35% Tint|19" Satin Black Avant Garde M359|Lux H8 V3
OEM Aero Lip|M3 Side Skirts|LCI Tails|M-tech Rear|Duke Dynamics CF Performance|Cyba 4.0 Black Chrome