That sounds interesting. I can't help you with neuropsychology, but I CAN tell you that my mom is a speech pathologist, and she works at a school district with a caseload made up primarily of children with autism and/or learning disabilities. I think most speech pathologists (who work in schools, anyway) do, so if you are interested in learning disabilities and how they affect abilities, speech pathology might still be a good option. Every day is a lesson in autism and learning disabilities for my mom...
Maybe you already know this, but I just thought I'd share. Whatever you end up doing, good luck!