Have you read Dr Ruf's book, "Losing our Minds" or Miraca Gross' book? Or looked at the summaries of Ruf's framework online? I think if you read both books or looked at the Ruf classification framework, you would see that your son is definitely GT. Those books will also give you insight into what options exist and what your next steps could be. (This site needs a FAQ!)

Your tester seems to be well informed. Based on my own experiences from 3rd grade and on with most public schools, he could become very bitter about school in general. 3rd-6th grade was a regular battle of wills for me and by the 5th grade I knew as much as any of my teachers. From 3rd grade until 10th grade, with the exception of two districts, public school was a huge waste of my time. I pretty much entertained myself.

How was your husband educated? What are his introspections on what was good and bad and what, from his own experience, should be done?