I've got to say Otto. I think he's really funny and very underrated. I wish he would do more than fucking hotel gigs in NJ but I guess if he could he would. I do get the feeling like most comics his style he has absolutely no faith in his talents as a good comedian.
Dave Attell, Bill Burr, Lil Jimmy & Hedberg I totally agree with but I'll throw in Doug Stanhope & his buddy Andy Andrist, Jeff Ross (kills on roasts), Dov Davidoff, David Cross, Joe Rogan, & Todd Barry.