For PG-13 I loved Matt Braunger - Shovel Fighter
For R-rated:
Chris Rock - Bring The Pain (an absolute game-changer for standup)
Dave Attel - Skanks for the Memories (his only great routine IMO but absolutely hilarious)
Dave Chappelle - Killin' Them Softly
Doug Stanhope - Deadbeat Hero
Doug Stanhope - Beer Hall Putsch
Dave Chappelle - Sticks and Stones