Far and away the most amazing book I've ever read is Proust's *Remembrance of Things Past* which is also on Barkley's list.
I also would put 100 years of Solitude on my list, along with Peter. The other eight are then:
Stanley Elkin, The Franchiser or George Mills
Dickens, David Copperfield or Bleak House or Dombey and Son
Anything and Everything by Wodehouse, with the Blandings Castle novels firemost
Charles Taylor, Sources of the Self
Hannah Arendt, The Human Condition
Smith, The Theory of Moral Sentiments