I have had good experience with Hatch & Sons for both bodywork and mechanical. They ARE expensive and they like to find lots of profitable work to do on your car, some of it possibly premature. They are decent people.

For superb body work in Boston area, try Dick's auto body in Somerville. Richard Mingolelli owns it and Frank Cirurso is GM. Not only are they very good at collision repair, they can match paint better than anyone I've seen. I had my '97 E420 in there three times for vandalism and severe parking lot damage in one sad year - so often, my picture's on their bulletin board.

Benz Den in Belmont is a good independent mechanical shop.

Jerry