I love Jeffrey Ross. Even seen him perform live once at Kung Pao Kosher Comedy -- which is Jewish comedy on Christmas in a Chinese restaurant in San Francisco. But the Taco Bell logo behind him really makes the photo.
Jem83 and Bianconero_Aus are great posters, but I don't consider them funny. Lion is usually the opposite of funny. Both piotrr and Fint can be hilarious, so my vote goes to Fint since he seems to be quite a natural.