I'm excited about going to Chantilly this year. I thought we were going to go last year but we ended up deciding not to.
Jaybunny, another show that is bigger than the Manassas show and the Richmond show (which I haven't personally been to but heard it is about the same as Manassas) that might be close enough for you is the MARS show in the Baltimore area.
MARS, Sept 13-14
http://www.reptileinfo.com/Events_Schedule.aspx
Chantilly NARBC, Nov 15-16
http://www.narbc.com/htm2006/va_index.htm