I've just ordered a c63 coupe, I'm starting to think I'm the only person that will not own an 's'.
Anyway, very similar spec to yours, I went:
Grey selenite magno
19/20 matte black wheels
Night pack
Carbon trim
White/black leather
Premium pack
carbon pack 2
HUD
360 camera
Air balance
I think that's everything but, it's off the top of my head. I think the main thing is just to make sure you have the premium pack, anything beyond that is take it or leave it. Obviously on the basis of my order, I think you'll have a very good looking car there!