The Krispy Kreme burger sounds nasty, but the other two sound okay. My favourite heart attack burger is Wendy's Baconator (a measly 1000 or so calories), but if you really want a burger you can sink your teeth into, the next time you're in Edmonton, go to the Motoraunt (66 st and Yellowhead trail) and have a Monster Burger.
With a bun the size of a dinner plate, two pounds of meat and half a dozen slices if cheeese (if you want you can also get bacon on it), it's a mouthful.