If you want something by Mises, maybe Liberalism or Planning for Freedom.
http://library.mises.org/books/Ludwig%20von%20Mises/Liberalism%20In%20the%20Classical%20Tradition.pdf
http://library.mises.org/books/Ludwig%20von%20Mises/Planning%20for%20Freedom%20and%20Twelve%20other%20Essays%20and%20Addresses.pdf
