I'm not the biggest fan of silver.. To me it's a "pretty" color and lacks the aggression of other colors you can get on the M3.
I think Mineral White and Fox Red is a match made in heaven and the red won't be as bright as you're thinking.
What are you leaning towards right now?
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