Pride and Prejudice by Jane Austen

The Adventures of Huckleberry Finn by Mark Twain

The Lord of the Rings by J.R.R. Tolkien

Little Women by Louisa May Alcott

Harry Potter and the Prisoner of Azkaban by J.K. Rowling (Okay, I'm a Potter-freak, so I love them all.  But this has been the best, I think.)

The Once and Future King by T.H. White

Big Fish by Daniel Wallace

To Kill a Mockingbird by Harper Lee

The Left Hand of Darkness by Ursula LeGuin

Watership Down by Richard Adams

Much Ado About Nothing by William Shakespeare (not technically a book, but oh, well.)

Flowers for Algernon by Daniel Keyes (The short story version is actually better than the novel.)

Dune by Frank Herbert

Dracula by Bram Stoker

 More as I think of them!