DUMFRIES? Hardly a desirable far out suburb. There is a reason it is cheap.
The difference between Prince William County and Fairfax/Loudoun Counties is that PW is pretty much dump with a still sinking real estate market...while FFX and Loudoun have continued to rise, even through the slow down. No decent jobs on that side of NoVA. It is all along the Dulles Corridor. You can live in Reston, and walk to work the jobs just keep coming..growth, growth, growth. It is nice for the people in the far out suburbs...good job, good schools, good communities and little commute.
My DH is making 275K/yr and it only takes him 15 min to get to work each day, though he often works from home. It is nice because we purchased pre-boom and are sitting on a mortgage of 2K for a SFH. We are on track to have this house paid off in the next 5 years and we are in our mid-30s. I think the key for many of us and why many of us are fortunate is that we purchased our homes early. When loans were cheap and easy to get, DH and i started buying in our early 20s.