I'm probably going to do a diploma of music after my arts degree, simply because, even if I don't get a job in the music industry, I'm happy to spend three years to better myself at something which in the very least could end up being my major leisure activity for the rest of my life. In my opinion, something like a humanities degree, or a music degree that's based primarily in theory is more likely to be go at giving you a way to "better" yourself, something that will improve your mind in ways that could be useful for your life outside of playing (anything that challenges your mind, I believe, is worthwhile). on the other hand, a tech school would probably be more "fun", but, unless you get a job playing guitar, it's not going to be as beneficial, I wouldn't think. Of course, I'm only 19 and 5'10, so my opinion is fairly useless.