What YA novel would you read again?

My sister is turning 13 next week (see previous question) and I’ve decided I’d like to send her a book. I’m in grad school but I enjoy reading young adult novels and I thought it might be nice for us to read the same book. My roommate also suggested maybe something that’s being made into a movie so that we could go see it together when I am home.

However I want a book that’s not sci-fi or magic/fantasy. It’d be nice if it was something to do with growing up/being a teen etc. The only candidate that I’ve found is the book If I Stay by Gayle Forman (http://www.amazon.com/If-I-Stay-Gayle-Forman/dp/014241543X/ref=pd_sim_b_1)

It’d also be interesting to send her something classic (Animal Farm etc). What book did you read as a young adult that you would/have read again?