I'd go down and scout it out. If you were commuting to work by car, I'd say avoid the 66 and 270 corridors, but looks like that won't be a problem. So you have tons of options, and it really depends on what you like. If you are purely concerned about rides and won't come into the city more than once every two weeks or so, probably better to be far out past the beltway closer to places like Frederick, MD or Manassas, VA. If you want to be near the city, there are many more options: NW DC, Capital Hill, Arlington, Alexandria, Bethesda, etc. You probably won't have as nice of rides in that case, and you'll pay more money to live there. So really depends on your personal situation.