Also in N. VA there is Wagonwerks (not sure of spelling) and in Rockville, MD some employees from Wagonwerks opened up their own shop.
One reason I mention Wagonwerks, when I was their last (2002) a women was there with her burgundy SDL. that looked as if it just came off the Benz assembly line. It was one of the most beautiful luxury sedans I had seen.

I hit a deer in a Mercedes C-class rental car last Feb. those things are unpredictable, better the car took the damage then you or your passenger.

The work Wagonwerks has done on my car I've been very happy with, twice they did work on my black sedan and I don't regret a thing. I live in Baltimore so when I drop my car off at Wagonwerks it is a subway then train ride home so for me it's quality not convience.