I can't speak as to East Coast Collision, but I was very happy with the job that Chantilly Auto Body did when Willie was rear-ended on 66. He had about $2200 in damage, which, if I recall correctly, included a scratch (but no dent) to the one of the rear Clubbie doors. I believe they did not paint the whole door, just repaired the scratch.
Additionally my boss swears by Advantage Certified Auto Group in Manassas Park. They specialize in BMWs and Minis.