You're question is hard to answer because nobody can predict the future. But take a look at the economics and the present market conditions in the area you're considering, in this case Loudoun County/Northern VA.
The local economy is strong, unemployment is one of the lowest of any region in the country and growth is still abundant. The future of the local economy seems fairly bright even with an administration change ahead (we're heavily dependent on gov't and IT). If you were looking in Detriot, one of the worst markets in the country due to the local economy, etc., we'd be having a different conversation. Make sense?
In Loudoun County and the area in general, inventory is still up, buyer activity has gone down and rates have actually dropped over the last few weeks - three excellent things to see as a buyer. As a seller, this is not good (this is good for you, the buyer). Basically, it's turned from a fairly even and flat market over the last 7 months to a buyer's market again. That's today - who knows about tomorrow.
The one thing to consider about Aldie is the traffic/road situation. You have Route 50 (Lee Jackson Memorial Hwy) and Gum Spring Rd as the major arteries in and out of that area. They are very congested due to the county being behind addressing the roads as growth has and continues to take place.
If you are commuting to somewhere other than Chantilly, Fairfax, Centreville, Manassas or further south in Fairfax County, Aldie may not be your best bet due to the commute.
If you are working in Loudoun County or parts of Fairfax County such as Tyson's, Vienna, Mclean, Arlington or DC, you may want to consider a property the other side of Dulles Airport (Ashburn, Sterling, Leesburg, etc).
Remember that a house is just that, a house. It is a shelter, one of the three things all humans need to survive. You buy it to put a roof over your head #1 and as an investment #4 or #5. Real estate eventually always goes up so as long as you're not an investor looking to make a quick flip and buck, you'll be ok.
If you would like more information about the real estate market in Loudoun County, check out http://www.LoudounStats.com
(personal site/blog with stats, data and resources). And if I can be of assistance to you in any way, feel free to contact me - I am the lead Buyer and Relocation Specialist for the CC Sells Team of Keller Williams Realty http://(www.ccsells.com
) here in Eastern Loudoun County (which includes the Aldie and South Riding areas).