Friends,
Once again, thank you for the advice. The story ends that I took my son to the Guitar Center where he found the Peavey, and after trying it for half an hour, he did not like it much, so instead he settled on a new Fender Hot Rod DeLuxe 40 1x12 (so I have lent him $550 instead of $400). My son loves the tube sound, and I guess 40 watts is enough for him - I listened to them play an outdoor gig last night, and while the PA was struggling to match the drummer (who always seems to have too much caffeine) and the bass player with his own 4x12 cabinet, the guitar came through the mix quite well.
Fred, thank you for taking time to listen to their music, I am glad, though, that my son did not see your comment before our visit to the Guitar Center (or he'd have tried to get me to "give" him the amp). I also like the "happy" quality of his music, as well as the fact that his ear for harmonies is totally different from mine (I am more of a traditional "3 chord+" person myself).
I think that often guitar players suffer from GAS (gear acquisition syndrome) even more than us the keyboard players - I only have 2 keyboards, the newest one is G1000 that is almost 8 years old. My son has gone through 3 guitars of his own (and at least 3 that he borrowed from friends), a banjo, a
a bass, numerous pedals (using one of my kb amps), and now his own amp - and I can afford to pay for my gear much easier than my son. I can also justify buying it much better, as I make more money in one gig than my son's entire band made in their entire musical carreer so far. It's hard to make kids (of all ages) happy these days...