I just moved from the ATL and Manuels Tavern is a great old bar, but in my opinion the best bar in Atlanta is the Bricktore Pub in Decatur, an old suburb. Bricktore has a belgian bar upstairs where they always have 5 on tap and an engine working as well. Downstairs they have a bunch of craft beers on tap and a beer menu showcasing the best belgian and craft beer from around the world that are available in GA. There are I would say at least 250 beers on the menu and half are from Belgium. The bar also has a great feal to the place and has some good food. It is quite popular and does get crowded though. I miss that bar.
www.brickstorepub.com