As much as i enjoy chris rock, he can get out of there.
Pryor is non Negotiable. My very first experience with stand up comedy was Richard Pryor Live at the Sunset Strip. I was just a kid and didnt understand a lot of it, but the little i did cracked me up and i was blown away that people got paid to make people laugh. Dude made some goddamn hilarious movies too especially when he teamed up with Gene Wilder. I still watch Hear No Evil See No evil and Stir Crazy sometimes.
Eddie Murphy is the one that i was going back and forth with Chris to get rid of. He only has 2 hours of stand up, but his movies were funny as hell growing up. He hasnt been that funny to me in a long time and Chris has always been funny to me, but Impact wise i feel Eddie had a bigger impact on Comedy in general.
Chappelle is one of my personal top 5 Comedians (along with pryor). Dude hasnt released anything i didnt enjoy. I recorded his HBO Half Hour on VHS a looooooong time ago and would watch it all the time. Killing them Softly and For What its Worth were purchased and watched at least a thousand times each. Dont even get me started on Chappelles Show. Dude disappears, gets buff, and comes back 10+ years later and still cracks me the fuck up. No matter what his involvement is, Writing a Screenplay, doing stand up, acting in a movie, directing a movie. If Dave is involved i will be one of the first people to check it out upon release.