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We visit Bud's all the time, even though it's a 35+ minute drive. Their burgers are always fresh and juicy, the buns steamed to perfection, and our bellies full on the way out.
The burgers come with what seem to be the sweetest onions this side of the Mississippi and Pickle Chips, Ketchup, Mustard or Mayo on the side, and chips. It's perfect. It's simple. We have been visiting for 2 years now, and will continue... in fact, this week!

A photo of one of their classics can be found here:
http://www.flickr.com/photos/jadydangel/2865720449/

As for "My Brother's Bar" in LoDo, Denver... We tried it based on so many positive reviews, and because it's open till 1 am. The atmosphere was nice, a corner bar fashioned after a London Pub, dark wood, library-esque feeling. The burgers, however, were dry, overpriced, and flavorless. I had ordered bacon on mine, and I have had better bacon at BurgerKing. (In fact, this bacon looked like Burger King bacon, only less cooked.) The 'Novelty' paper wrapping of the burgers, served in a 'tray' with condiments was cute, but did NOT make up for the lack of flavor or quality. The burgers were also close to $12 apiece, versus Bud's Bar's $5. I'd not even recommend "My Brother's Bar" as a last resort at 1 am: You'll find better eats at Taco Bell.

This is my favorite pick in george's book. To me...that is what the quintessential burger looks like.