It sounds to me as if he would love most of the Ivies: can major in a STEM field while still taking rigorous humanities courses, students with broad intellectual interests appreciated, lots of energetic, intelligent highly-verbal classmates many of whom are similarly driven. He’d be highly unlikely to be bored. They are such an obvious choice one hesitates to mention them to most people, but he sounds like the kind of kid who would naturally fit in, especially at Yale and Dartmouth, perhaps.
It doesn’t sound to me as if your S would really feel fully engaged at a tech/engineering school, which is why Rice/Stanford/Ivies/Northwestern et al would fit the bill. Of course, any number of the great midwestern flagships, such as U Minn and U Mich, would give him a fine education, and presumably he would be in the honors college.
My father went to college intending to be pre-med, but switched to chemical engineering because he found that the pre-med courses weren’t challenging enough, LOL. He would no doubt have been a superb surgeon, but he was also a natural engineer.
What state are you from? Are you looking for safeties and matches? Reaches are easy to recommend. 