Surprised it hasn't been mentioned (or at least I didn't see it) but my personal favourite is the Sour Dough Jack from Jack in the Box.
Close second for me is Double Fat Boy from Junior's in Winnipeg. (And before anybody begins the MJ jokes, for some reason every Greek burger place I know of calls their signature burger a Fat Boy. Actually, I'm not sure that makes it any better.)
Best I've ever had was a Wendy's Steakhouse burger- I think it was a special about 2 years ago. Imagine a Baconator, with sauteed mushrooms and all cooked in a Montreal Steak Spice kind of sauce.
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