Welcome! BMW of Fairfax and BMW of Sterling are closest to you. They both have their issues but I still much prefer Sterling. I still haven't found any bodyshops in area I'd recommend. I've used D&V autobody and Royal, both in Sterling. Both are fine, but kinda pricey.
When in warms up, go to the cars and coffee event (every saturday morning in Great Falls, VA @ Katie's coffee house) sometime.