Hey, thanks everybody, sounds like cello could be a good pick, maybe a smidge easier, at least easier on the ears. Yes he definitely has perfectionist leanings so if it sounds just horrific that could be an issue, good points!
Band doesn't start until 6th, I think, but they can pick a string instrument in 5th. So if percussion is available via band, I think that will be a good idea then, but I figured he'd get some good out of the string program and he sounds pretty interested.
...We just saw some incredible cello solos from a guy in the large band that Lyle Lovett has, and it was just phenomenal!