Everyone listed thus far is fantastic.
Joe Rogan actually has important topics of conversation, which I like.
Russell Peters is great on the racial stuff, but I've grown tired of the same routine.
Edit: He was also a guest on Infowars recently. No surprise, it's right up his alley.
Hedberg and Dangerfield need no explanation.
As for me, I've always been a fan of Louis C.K. and his new show is fantastic.