I agree with you, I love the books they are one of the best series I have ever read! I am twelve, I wouldn't have thought a eighteen year old would have like them. I have read the books ever since my brother got them for me for my ninth birthday.
I would recommended for you to read The last Vampire by Christopher Pike, The Demonata and Cirque du Freak by Darren Shan and White Crow, The Black Horse and The Shadowing by Marcus Sedgwick. I have read all of them and a LOT more books but these have to be the best! Anyone who is reading this review go and read these books I grantee you will not be disappointed.