I love all the guys on the Blue Collar Comedy Tour. Bill Engvall, Jeff Foxworthy, Larry the Cable Guy, and Ron White are all really funny. I also like Gabriel Iglesias and Jeff Dunham.
Lewis Black is pretty freakin funny. My friend has this series of comedian movies called 'Bananas' Most of the comedians in that weren't all that famous but still pretty good.
Colbert: "Truthiness" Jeff Dunham is pretty funny, too. For the sound of it, Dane Cook is funny, but I've never seen him or heard his jokes before (as far as I know!) so... I'll check him out I guess!