I second this--it is a very good gym. Tim Henriques who writes for this site also runs a Powerlifting Team out of there and the guys there are all real friendly.
Also you could hit up MarauderMeat who a few weeks ago was looking for a few new guys to join him at his gym in Chantilly. YOu will get strong as hell.
It really does depend where in NOVA you live though--if you are inside the beltway, forget about going west until later in the day because rush hour is a bitch. LOL @ winchester only being 1 hour from NOVA--maybe Manasass without any traffic, but if you're in REAL NOVA, and aren't travelling there at midnight, you will be doing well to get out to Winchester in an hour.
But the truth of the matter is that the douchebags and yuppies in this area just don't make being strong much of a priority in their life. Plenty of happy hours though. Pack your brown flip flops.