Green's definitely, it's near the con site too. Go down Peachtree St NE (street in front of the Hyatt, the direction you want to take is right if you are exiting the front door). Follow that for about .7 miles and take a right on Ponce De Leon. Green's is 1.3 miles down that on the right, in front of a Kroger's (making it a one stop shopping trip if you need food and stuff). They have an amazing selection of high grade beer too (check out the walk-in cooler for the BElgian Abbey Ales).