I believe you should make your buying decision based on your own need, NOT all the rumors or so-called forecast since they often turned out false.
Fairfax VA is one of the best places I ever visit, and I believe many people would like the town like you. The area is expected to boomed due to the Dulles Airport that many Asian moving in and invest in the area, so you can expect foreign investors kept coming to the area.
You should consider buy right now when the mortgage rate just collapsed http://riverheightsestates.blogspot.com/
and many housing bashers out there to hammer sellers' confidence, and if you start shopping and end up buy at Thanksgivng time you may find some great opportunities, and may be close some time grab a great low rate.
As first time buyer, you may buy a condo or townhouse so that you will not be overwhelmed by the maintenance of outside of a single family house. Also, just buy what you need, say, if you are a young couple just buy a 1br or 2br condo, or if you have a kid, buy a 2br or 3br townhouse, and you will find in the future, you may have lots of flexibility.
Ideally, you would buy a 1br condo now, if big enough, then after you move in, you may buy another 2br to move up a year or two later, and rent out your 1br condo, and later move up to 3br townhouse and rent out your 2br condo, and eventually move up to your 4br single family house and rent out your 3br townhouse.
In next cycle of real estate boom, you will have a chance to sell all your 1br, 2br and 3br and realize the gain.
Note, you have to do it in this sequence since if you bought a bigger home first, say, 3br townhouse, and later you want to buy a 1br, the bank will think it is "investment" and that rate and point fee are much higher than owner occupied loan.