Glad CS Lewis is there. Should be higher, considering that he was a deep thinker as well as a great writer.
No G. K. Chesterton on the list.
Over the last few years I've been trying to read all of the "classics" I missed when younger.
I work off of four different "Best 100 all-time novels" lists (R. McCrum - The Guardian, D. Burt - Adherents, editors - Goodreads, and the Board of Modern Library).
It's a fun hobby. Especially when I don't have to write essays about them....