Snowshoe is about 4 hours I think from DC, I haven't been there yet but i heard its the best within that time range around DC.
7 Springs is also good, they have some sick setups, and is also about 4 hours.
Wisp was pretty sick from what I remember but I haven't been there in about 4 years. It was about 3 hours away I think.
If you're looking for a day trip then i'd have to say Liberty, Whitetail, Roundtop, you can get there in about an hour but those places make you shell out like 50 bucks or something for 4 hours on the weekend and i think 40 during the week which will burn a hole in your pocket for what your getting (which is not usually that great).
Other than that I heard that the Shenendoahs are good for pow in this region. They close skyline drive when it snows so there are no cars and you can hike up. Supposedly they get better snow than any of the resorts, and if you look, there are some good mountains to hit up for some pow. There aren't parks out there though because there aren't any resorts on Skyline.