Letterman, Leno, Daly, Kimmel, or O'Brien?

Whos got the best show on late night? My personal favorite is Conan O’Brien because of his wit and sarcasm. He has a great opening where he discusses international affairs but ends each topic with a sly remark. I know his format is similar to the other hosts but his energy and demeanor is like no other. So I ask you, who is your favorite late night tv host. Is there any I did not mention?