Goyarddad,
If your son plays at a high level and travel does not bother you then I would think you would want the best travel team AAU etc. for that age group. If he is 14U AAU is generally the better travel competition. NVTBL is more organized along HS lines as previously mentioned.
Try this link to Va. 14u teams through ETEAMS. You should be able to get a flavor for what's available. knowing what area your looking to live in would be needed to provide more specific help. I'm assuming you know the communities/cities in NVA.
http://eteamz.active.com/baseball/sites/finder/state.cf...fm?sort=name&spage=2