As far as I'm concerned, Capitalism is the economics bible--the end all be all.
Though it takes literally years to get through, what one learns is thorough, concrete explanations of how the world really works. There are brilliant,innovative analyses that no one else has ever thought of--though most of Reisman's knowledge is an integration of all the correct theories he's learned from reading seemingly all Classical and Austrian works, not to mention Keynesian and Marxist (the works he proves incorrect).
I highly recommend reading this book in conjunction with listening to his audio tapes (available on his blog/website). They are not cheap, but are the best economic investment I've ever made. The audio helps one to grasp the ideas in the book much more quickly.