Teenage boys - what books do you like?

I teach 9-12th grade English and I require my students to do daily reading. They can bring a book from home or the library, but I also have a classroom library with books they can borrow. Here's my problem: I have lots of books for girls, but I'm stumped when it comes to picking books for boys. So my question to teenage boys is, what books do you like? What do you actually want to read?