In the line of vampire novels:
The Shadow Saga by Christopher Golden
Of Saints and Shadows
Angel Souls and Devil Hearts
Of Masques and Martyrs
Completely redefines Vampires, and their relation to the Catholic Church (the whole can't go on scared ground bit) Among many other things relating to demons, hell, and all the monster myths you've ever heard.
I'd also like to recommend Larry Niven to Sci-Fi lovers. He does interstellar Level science fiction, but he pretty much takes the fiction bit out of it. Almost everything he writes his based on actual physics, and his stories are more about laying down what things would be really be like when all our theoretical science becomes real. Stuff like Exploring the center of the galaxy, examining Nuetron stars at close range, you know the important stuff.
Ringworld is a fantastic starter novel For Larry Niven's books, and a must read for any hard core Sci-Fi fan.