Well almost all of my quotes are Steven Wright so he is probably up there just for his brilliant one-liners. However recently I have been listening to alot of Jimmy Carr he is very funny and quite dark. He makes his jokes so that your reaction is too laugh but then when you think about the joke you go oooohhh.
Hmm, this is a toughy, I will name some comedians which American people probably won't know.
Russell Howard, a kind of new guy, done a great gig at Live At the Apollo. And Russel Brand is a great one too. But Billy Connley is like a legend to stand-up, just brilliant.