There was talk a few years ago of a Disney park in Manassas.
Well, [link|http://www.nps.gov/history/history/online_books/mana/adhi0.htm|1993] is more than a few years ago... They had to back down. But Manassas is getting to be a popular area. I would expect it to grow more in the next few years, as Prince William County has been doing (though there are some [link|http://www.vagazette.com/news/local/va-news3_100307oct03,0,95253.story|efforts] to gain control of the growth.) Another major development proposal there wouldn't be unexpected in the next 5-10 years.
Actually, it doesn't look like the drive would be too bad, but [link|http://maps.google.com/maps?f=d&hl=en&geocode=&time=&date=&ttype=&saddr=manassas,+VA&daddr=Herndon,+VA&sll=37.0625,-95.677068&sspn=40.817312,62.138672&ie=UTF8&z=11&om=1|31 minutes] is probably wildly optimistic. :-)
Good luck.
Cheers,
Scott.