I second The Postman by David Brin. Where much post-apocalyptic fiction is very cynical, The Postman is much more optimistic. Most of the "after the bomb" stories, especially from the '80s, degrades into some kind of extemist fantasy where the heroes re-build civilization without all the "weakness" found in the pre-bomb society, The Postman embraces many of the values our post-Enlightenment society holds dear.
I actually enjoyed the movie, as it holds true to the tone of the book. It is not a great movie, but it was hardly a disaster. Even David Brin likes it.
http://davidbrin.blogspot.com/2012/11/the-postman-re-appraisal-and-readers. html