Only one I know of that has any history behind it is Humber Collegiate.. you'd have to move to Toronto tho.
I've heard both good and bad things about guitar schools. On the good side, you'll probably learn a whole mess of theory & scales, and your playing will improve a lot cause you're totally immersed in guitar every day.
On the bad side, some schools are very oriented to a particular style of music. ie, Humber is supposedly all about jazz and nothing else. Not that I'm saying jazz is bad or anything, but if it isn't the kind of music ya like, you'd have a hard time getting along with the teachers & students. (my info is about 15 years old tho & things might have changed since then)
Course, there's always the other option... just make friends with people who go to a guitar school and 'borrow' their homework for a coupla years.
Free education and no tuition!