The Vortex has become an institution in Atlanta because of its amazing beer list and even more amazing burgers. The Chili Cheeseburger is big, meaty, covered with the perfect amount of chili, and it was cooked exactly medium.
I used to live in Atlanta, and if I still did, I would eat at the Vortex every week. They have TONS of different burgers and they have all been great. The waiters/waitresses are usually cool too.
I like the one in little 5 points, but the downtown location is good too. Great burgers.