Personally, I wouldn't commute to DC from WV or even Calvert Co. Traffic is too bad, and you couldn't pay me enough to want to spend that much time in the car.
I moved from Greenbelt, MD (about 20 minutes north east of DC in rush hour) to Herndon, VA last year since I got a job in Reston, VA. I commuted for a month before we could move and some nights it took 2 hours for the 35 mile trip around the Beltway
I really liked Greenbelt and if I was still working in DC, we wouldn't have moved. We don't have kids, so schools weren't a very big factor for us though. But there are some good schools in Greenbelt, including a Goddard Elementary-- a French immersion school which is supposed to be great. In Greenbelt you could probably get a nice size townhouse in your price range. We sold our 3 bedroom, 2 1/2 bath townhome there last year for $298,000 and I'm sure it's gone down since then.
For comparison, we now live in Fairfax county in a much smaller 2 bedroom, 2 bathroom condo. We bought for $367,000 a year ago, it's now worth about $348,000 (I just keep telling myself we'll be here for several more years and it doesn't matter what the current price is

). Our property taxes were a bit more proportionately in VA, but our income taxes in VA are a lot less than MD.
Having worked at a college that had teacher certification programs that catered to DC public school teachers-- I would never, never, never put a child in public school in DC. I'm sure there are some wonderful teachers in the district, but I saw way too many awful ones to ever consider it.