You have some really nice roads to the north and west of you. 211 up to Skyline drive is fun but some of my favorites are Hume Rd (635), Crest Hill Rd (647) and Leeds Manor Rd (688) just the other side of Warrenton from you.
On occasion, I was stationned at the Marine barracks in DC for 3 years, lived in Alexandria for a year after that and I still have friends in Annandale and Sterling so when I visit we'll ride the area.
im in the harrisonburg va area but ill hit you up if im close for any reason. they have car/bike shows in manassas every friday (i think) at a burger king. ill have to find the old thread on the GTO forums.