Don't live in Dumfries or Lake Ridge. If you're buying a house, Montclair is a nice neighborhood, and pretty darn close to MCB Quantico. Are you working in Quantico or just looking to move into the area?
Southwest of Quantico is booming. I used to Skydive at Hartwood airport in the late 80's and early 90's. Aquila/Garrisonville is directly south of Quantico. I miss the Bar-J Chilli Parlor.
Lots of food options in Woodbridge. I've been living here since 2006. Three gun shops in Woodbridge, plus a few more in Manassas. If you live here, you're going against traffic to get to Quantico, so it's an easy commute.
Potomac Mills is pretty massive, gander mountain, sams club, Dicks, Lots of restaurants, outlets there also.
And lets not forget Quantico Tactical http://quanticotactical.com Their gun prices rival that of online stores like buds. Their transfers are cheap too $15 + $2 for VSP