I loved The Chapelle Show, but I have never seen his stand-up. I think Eddie Murphy is funny as hell. My favorite is the late, great Sam Kinison. I had the honor to see him live with Pauly Shore. We had some brownies that night and I thought I was going to need oxygen by the end of the night.
I have tons of favorite stand-up comedians. My favorite website to watch their clips is here: http://www.rooftopcomedy.com/ They have lots of great stuff!