A Quest for Burger Greatness

I'm a Seattle dweller normally, but my boyfriend lives in the Twin Cities, so I'm out here visiting pretty often. He and I are on a quest to have (find? whatever) the best burgers the Twin Cities have to offer.

Of course there are endless lists online, Yelp! and UrbanSpoon reviews, etc, etc... Even old Chowhound threads. But when it comes to such things, I find time is of the essence (that is, a spot that was great two years ago may now be awful, or closed; conversely, other places improve, or new ones open), and there is no greater fountain of contemporaneous foodie knowledge to be found than Chowhound.

We've already tried Bulldog NE, which got our seal of approval. We've also had burgers at Ginger Hop (solid), Pat's Tap (big thumbs down), and Chatterbox (decently tasty). Blue Door is on our list to hit this week.

Where else should we try? (Note: We're well aware of the classics, like Matt's, 5-8 Club, and Nook. While we're not UNinterested in these places, it'd be helpful to get a legit sense of where has a great burger versus just a great history/reputation/atmosphere.)

Thanks!