My favorite, and one I don't see listed here yet, is Walter Williams.
RE: Walter Williams...
I can't agree more. I like him too. ...He comes across as a little more 'sane' than some of the others mentioned. (...sadly)
Quotable: "What's *just* has been debated for centuries but let me offer you my definition of social justice: I keep what I earn and you keep what you earn. Do you disagree? Well then tell me how much of what I earn *belongs* to you -- and why?"--Walter Williams