Are schools an issue?
If you homeschool, I'd definately research laws relating to hsing in each state/district. In MD (where we live) we signed up with an umbrella group and they take care of the rest.
DC lawmakers just created a law almost identical to MD's, but it will be awhile (one would assume anyway) before the umbrella school list is populated...so you might have to endure school-system oversight.
I haven't looked at VA's laws.
We are currently in No. Bethesda, having moved here about 3 months ago almost sight-unseen (dh had, I hadn't). Now that we know where dh's office will be (was up in the air) we will stay in MD for the foreseeable future. But we are looking to move up near Rockville or Gaithersburg. The Shady Grove station is the end of the redline of the metro...and that would be our target area, since dh can metro to his office near the grosvernor-strathmore station.
Home prices, and especially property taxes, are extraordinary everywhere in the metro area, though.
Montgomery Co. MD seems to have a most excellent network of parks. We have been devoted to exploring as many of them as possible before winter. And we love being pretty close to the district...just a quick metro ride on the weekends and we are 'resident tourists' with glee.
Welcome to the area!!