Colbert, on the Colbert Report.
Pete Holmes was really good too, imho.
Too young for Carson or the like. Jay Leno fucking sucked, Jimmy Fallon sucks, that nerdlinger that follows him sucks, don't care for Corban or whatever. I don't much care for Colbert as a serious host either.
John Oliver is good, so is Samantha Bee. But yeah, Conan the best.
edit, forgot Jimmy Kimmel. He's good, too. His skits and promos are better than his show though, imho.