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I say go for black accents - vents, wing, mirrors. That grey NEEDS contrast. I'd also go black with the wheels vs grey. If you have a 3 piece wheel go with a satin black center and gloss black lip - just to break it up a bit.
ill just say this. consider your wrap heavily. i had randys car which was wrapped in matte orange. first thing the installer was a hack. worst wrap ever. it completely ruined the look. 2 was the matte finish. with no wax on it the wrap clinged to every dirt mark every bug and oil mark. just sitting outside it became dirty and wouldn't clean up. magic eraser, comet, some bleach nothing would take the dirt out of the wrap.
wraps aren't cheap. be careful what you choose.
Keep in mind any accents done in a deviating color will become a focal point and your eyes will be drawn to them. Too many accents, or misplaced, will draw attention away from the "whole" and to the accented area. If this is what you want, do it.
I see way too many "amateur" customizers doing what they think looks cool and in reality, it looks awful, tasteless and from a design point of view, all wrong. Obvious design cues generally never do it. It's usually the most subtle things, stuff that you really have to dig for and is not obvious that make anything truly wonderful to look at.
Rear winglet and mirrors might look nice in gloss black, if the wheels are gloss black too. Side intake vents I always prefer them in body color. It was tempting to do it in black in my car, but something made me feel it will be too much. I am glad that I have kept them in body color. I still prefer the mirrors in body color, but my car was a cabrio. It might be different in a coupe.