Dubliners and Gatsy are great suggestions for that age. Good heads up on Alexie. It's been a while since I read him. I believe some of his books may be more tame than others (he has quite a lot). I think some are used in high schools. I'd look at current HS reading lists, too, and just pick and choose for more current stuff, and things that look like they'd appeal. Oh--I really loved O. Henry's short stories at that age, as well as Ray Bradbury.