Don't really know what you like, I enjoy the classics and Charlton Griffin as a narrator so I stocked up on him.
Meditations by Marcus Aurelius
Democracy in America by Alexis de Tocqueville
On the Nature of Things by Lucretius
The Aeneid by Virgil
Dostoevsky's the Idiot, Crime and Punishment are next on my list, as well as Milton's Paradise Lost and Regained, and Tolstoy's War and Peace when i get my next two credits