Have you considered private schools? I know they are crazy expensive but the cost difference between a house in Billerica and one in Winchester is probably the same delta. I'm sure there are programs, grants, etc. Just have to do the leg work.

I only say this because I went to public school in one of the wealthier metro west towns and I know many parents who are not getting the support for their special needs children. The best public schools focus most of their efforts on the kids who excel under traditional learning methods.