No. Not unless you can buy it for at least 30% under current market prices today. Why? The lower-priced condos, such as in Shadowood, have tanked. Three bedroom units that had sold for as much as $300,000 are now on the market for $175,000-$180,000. The two bedroom units that had sold for as much as $275,000...listed around the same price, but few are selling. That's due to a number of factors--lots of foreclosures in the lower-priced condos (due to investors who bought at the peak, expecting prices to go higher, and new owners with poor option ARMS), high cost of commuting to any place except Reston or maybe Dulles, and much better deals closer in.
The higher priced condos in Reston generally have high condo fees, and--it could be argued--were pretty expensive to begin with.
Your problem also would be cash flow. The Shadowood units are getting to the point where they almost cash flow--buy one for $150,000 and rent it out for $1,100. But watch out for negative cash flow, especially on a long-term hold.
If you really anticipate holding it for 10 years, can bear to watch prices decline another 10%-30%, then you'll probably come out OK. Real estate, of course, is cyclical, and prices will rebound somewhat...probably in a couple of years. But I think there are far, far better places to buy in Northern Virginia. And I'd suggest a single family home or at least a townhouse.