I know it is often very difficult planning a move. Add to that finding a school to meet your sons needs can make it even harder. Even though my son is high functioning, I understand your concerns. We have been thoroughly pleased with the schools addressing our son's needs. I hope you find the same results for your children.
Have you tried to contact The Autism Society of NC? The Charlotte office has some wonderful people there that may be better equiped to offer some advice. They were very helpful to us when we were planning our move. I would also recommend a phone call or meeting with the Director of EC services for your area.
Autism Society of North Carolina This link is for the ASNC and will provide you with some very important phone numbers. Best of luck to you.=0)