A little stir it up conversation

This is a weird topic but it's been in my mind lately. You see I love the Twilight books and the movie! Can't wait to see New Moon when it's released. It's always fun to share your excitement with friends and yet I have a very good friend of whom I would trust with my life. I wanted to ' talk Twilight' with her and she totally challenged me (unintentional I'm sure) She said she only sticks to Christian books and Authors. That was it. She didn't scold me and say Vampires were of the Devil, she just calmly rejected reading the books and said they were dark. So my question is this, since I am also a Christian is it wrong for me to thoroughly enjoy? Are tales of Vampires and other things like Harry Potter, anything on the 'dark' side wrong for me to like? I mean, I'm not changing my religion or practicing witchcraft. I'm not obsessed completely with these things. So, I'd like to welcome any comments or points of view on the matter. For myself, I think there's balance for all things as a Christian, and that opens the floor for more discussions.