"well-educated" in what? just all around?
i'd go with Machiavelli, Voltaire, Steinbeck, Dostoevsky (if you can read him. i find him horribly dull), Plato, Socrates, Jonathan Swift, Mark Twain, Kafka, Marx/Engels, Hobbes, Anatole France, Rushdie, Houstn Smith - Religions of Man, W.E.B Dubois...