Hmm...haven't watched a lot of Jack Dee's stuff to have a good opinion on it; but the Cold Calling clip wasn't too bad (I can relate; having done work exp in a contact center xD)
Russell Howard? Love his stuff on Mock The Week! Though that's all I've seen him do. xD

I don't really follow a single comedian per se; but Russell Peters (Canadian-Indian dude, look him up on Youtube) isn't too shabby in my books. Otherwise, I get my fix watching MTW and Whose Line (yes, BOTH versions!) ;) Shame Frankie Boyle's no longer on MTW. :/ x