White or Steel Grey
1. It's a better color, IMO
2. It will stand out compared to all the white C300s, C350s, and C63s.
3. I white cars show more scratches, and everyone knows some jealous SOB is gonna nick your door in parking lot.
Just my $00.02
Steel Grey with the beige interior looks nice. Very modern looking combination, and the way MB did the colors, the parts of the interior that often get scuff marked a lot, i.e., doors, sills, etc, are black and not tan so it makes a lighter interior a bit more maintainable.
Steel Grey is pretty dark so it will show swirl marks more than the white. White will save you $710 if that matters.
Both are nice so I would not expect either color to have a negative impact on resale value




