Tim: it sounds like your son is a talented player. Budget for 1 local (usually free or very inexpensive) 1 regional & 1 national showcase if he wants to look throughout the country.
After sophomore season is over send info page with his vitals/stats to schools he is interested in or blanket mail a bunch of schools. Follow up and answer all questionaires & call schools directly to show your interest.
Imo the services do for about $1200 what you could do yourself for about $150. NOBODY will have the same interest level in getting your son placed as you or he will.
Be aggressive, hit a few college camps along with good travel team and he'll be fine. If senior year approaches and interest is minimal use a service as a last resort but usually local coaches/scouts can help kids find a place to play. Good luck! Your off to a great start by visiting this site.