Suecat, thank you for taking my post in the way I intended it. I was unsure about answering, but I felt you deserved an honest reply.
The Mt. Vernon Valley area can work for a couple with the right attitude. I wouldn't feel right about encouraging someone with young children to move there, but I know I would not choose to live in the area again.
There are a few bargains in the 22152 zip code (under $300,000) right now. The neighborhoods and schools are good. You might also check in North Springfield. Some of those homes are on nice-sized lots and are very well-built/well-maintained. These neighborhoods are more diverse and more community-minded.
We are military renters, so I have done a lot of research!