I've lived here in Centreville for about 3 years now. I'm a VA native, and I love the state, but I sure wouldn't work here if it weren't for the government man job. I'm starting to look into buying a place, and the prices are astronomical. The traffic is nuts, and if you aren't an a**hole driver, you'll become one in short order, or become a speed bump. When I visit the folks, Mom always asks why I'm such an aggressive driver now.
Manassas is a decent town, but there's no real way to get into and out of it easily without hitting a logjam during both rush hours. I admit I haven't exhaustively studied all the pig-paths on the map, but anyway.
Fairfax County is pretty decent in terms of gun friendliness. I've open carried a fair amount of times around here, and nobody's harangued me about it or called the cops yet. The closer in you get to DC, the more the liberal fumes seep out and poison the weak-minded. I've heard horror stories about the Arlington PD's treatment of people lawfully carrying, and you have the nutjobs running places like Falls Church pulling stunts like trying to get people harassed for carrying into town buildings.
If you get a job in Arlington, though, you'll spend most of your life in the car if you live in Manassas. My office is about 15 miles from where I live, and it takes me 45 minutes to get there. If there's a wreck, all bets are off. Heck, sometimes you get a huge slowdown, and you start to hope for bodies covered in tarps on the road for this kind of delay, and then it opens up again for no reason at all.
Also, you'll encounter delays at random times other than rush hour, again for no discernable reason. Also, you'll get people driving at the speed limit or below like some sort of vigilante in the left lane.
Most of my friends live in MD or further in, so it's a major production for us to be able to hang out because of the traffic. I'm looking to move further in when my lease is up.
I love my job, so I put up with it, but if I didn't have to live here to work there, I'd be gone someplace where the cost of living isn't that bad and traffic isn't insane.
My $.02.