In Virginia, look into staying in Arlington (the Crystal City area, near Ballston or Rosslyn). If you are staying near a Metro station, you won't have to worry about parking your car at the station, you could just leave it at the hotel. Some people have stayed in Bethesda, MD near the Metro station. Another possibility--Alexandria, VA or Springfield, VA--there are hotels near Metro there. You could go even further out--there are hotels that offer free shuttles to the nearest Metro station. However, you could find that it will take longer to get into the District. My advice? If you are here during the week, you don't want to have to drive to a Metro station. There is a fee to park during the week and the lots and garages fill up very early.
would greenbelt maryland be an ok option????
There are some pretty cheap hotels there such as Hilton Garden inn for about 130/night
If they offer a free shuttle to the Metro station then, yes, it would be a good option. BTW, have you tried entering your dates into www.quikbook.com to see what comes up?
$130/night in Greenbelt vs. how much elsewhere? Personally, I don't think a long commute is really worth it for a few dollars savings, but for $50/night, maybe...