Good essay collections?

I've been reading the George Orwell collection published by Everyman's Library and I plan on getting collections by Plutarch, Francis Bacon, Michel de Montaigne. I also enjoy reading Christopher Hitchens and William F. Buckley.
 
Are there any essay collections or any books in the political/philosophical vein that /book/ would recommend?

It is kind of a collection,but W.E.B Du Bois' The Souls of Black Folk. Maybe because I am a black annon but he also has wonderful prose.