I've actually had some awesome experience recently (both for a bumper repair/respray and some pdr) with Total Recon in Rockville. It was well worth the trek across the beltway. They even provide free loaners.
https://www.yelp.com/biz/total-recon...nter-rockville
Their reviews drew me in and they definitely delivered. I know a bunch of other good NoVA shops but these guys are stellar.