Good post! I have read many of these books, though far from all of them. There are a lot of good resources online. Some of these books are even available as audio books, and some have been translated into several languages.
I usually recommend the anthology Anarchy and the Law (not for free though). I don't agree that it is for proficient readers only, it works for beginners as well. It gives a great overview and features excerpts from several of the other books including David Friedman's classic The Machinery of Freedom (which is available in pdf on the author's website: http://daviddfriedman.com/The_Machinery_of_Freedom_.pdf)
Thanks for the suggestion!
Following you now.