I don't think demetri's style is that innovative, but he's got a charm and his jokes are funny. maybe it'll wear off over time but right now I still enjoy his jokes. He's got escalator and fruit jokes and and "something is lot like something else" jokes that are pure mitch hedberg, but he's got a good voice and good delivery, there is just something serious in his voice that makes things a little bit funnier.
Brian Regan though, I've always loved--aside from a few months in 2004 when he tried to be political, his material is just soooo solid. I mean, the thought of a guy walking into a spider web is funny enough, but just how he acts it out too! And his entire half hour routine on eating and fitness and middle America. He's really clean and accessible to the Middle America, yet he also makes fun of them like crazy. What a good combo.
still, if you wanna see real emotions, watch Chappelle in a club or something. That guy is great. He's truly subversive. He is the one comedian I see who does comedy to empower people.