I'd have to say Dave Chappelle. I was always a big fan of his prior to his TV show and find myself being an even bigger fan now. His whole bit about Chip racing and the baby selling crack still have my dying whenever I hear them.
On top of that, he's also a great guy. He lives right near my city here in Dayton, OH and he is a regular fixture at the local Best Buy! Instead of being snobbish or rude, he will speak to anyone that approaches him. All in all, just a great guy.