Hi Joost,
For me the titanium grey color was the option to go, since it combines the sporty look and will also stand out more compared to the black rims. My other input is also since it's titanium grey, the tire will more highlighted. With black rims the tire and rim will more or less merge, if you look from a distance. However I do want to point out that black is really great on certain colors, but was not the way to go for me personally.
I hope the picture could give you an idea.
Unfortunaly I have to wait at least two months before they will be on the car.
Meanwhile I will perform the stage 1 or 2 with BSR tuning chip (made the mapping for koenigsegg...is in my home town) or go for the VTECH 322 HP map

BR
Robert