Thanks for all these comments.
Nik -- was your DD given an ADHD-inattentive dx based mostly on the spread in her WIAS scores? Did they do specific tests for attention and executive function (besides the behaviour rating scales)? The neuropsych. I spoke to proposed specific tests (not IQ or achievement tests) related to attention, EF and memory.
I'm still mulling over my options here. The person I spoke to seems like the only neuropsychologist in my area who deals exclusively with children and adolescents and he did sound smart and well-informed.
He also does gifted assessments, so I think his comment about not being a fan of gifted schools was probably more to do with the philosophy of the programs in my location.
I asked whether if was a problem to re-do the WISC, since our potential app't would be a year or maybe a month or so less since the previous testing. He said that a 60 day gap was enough -- it sounds like this might not be correct? I didn't necessarily want to have it re-done, but he thought it would be better to do it again.