I don't know any good real estate agents, but I know a lot of people who live around there.

I also know a few people in the area who have autism spectrum kids, so you would be far from alone - and since Manassas is in the Greater DC area, you do have a ton of resources. Not to mention nice and close to the mountains. :D

If you want me to boost your signal, I can post on my blog, or I can just sniff around ;)