1. The Most Dangerous Superstition, by Larken Rose
2. Atlas Shrugged, by Ayn Rand
3. The Discovery of Freedom, by Rose Wilder Lane
4. Why Government Doesn't Work, by Harry Browne
5. The Law, by Frederick Bastiat (I would have put Hazlitt's Economics In One Lesson in fifth place, but you've already mentioned it.)
Recommended reading: The Most Dangerous Superstition, http://www.amazon.com/Most-Dangerous-Superstition-Larken-Ros...