If we are just talking 'classic' 20th century novels, your list should include:
Rabbit, Run by John Updike
One Flew Over the Cuckoo's Nest by Ken Kesey
Blood Meridian by Cormac McCarthy
A Dance to the Music of Time by Anthony Powell
Lolita by Vladimir Nabokov
A few years back, I managed to read all 100 of Time's proclaimed Books of the Century. I was traveling a lot and had a lot of free time. I was most surprised by Lolita, given the subject matter, but the writing style is stellar.
I recently read
Never Let Me Go and I enjoyed it quite a lot. I don't read many novels these days...more eclectic texts on odd subjects like
Edison's Eve, which deals with the history of animatronics and the quest for mechanical life, and very old natural history and medicine texts.
I also just bought a television, the first I have owned in well over a decade so I am rotting my brain with television these days as well.