That Gwinnett Guitar Center will fool you. It is way bigger than it appears based on the sign outside. It looks like it is going to be just a small store, and inside it is big.
Another store worth checking out. It is more of a guitar store though. They have pretty nice guitar amps, Taylor and Martin acoustic guitars, but their effects pedal selection is usually better than typical guitar stores.
http://www.atlantamusicbrokers.com/
I have had some good work done here:
The Fret Shop
2264 Fountain Sq
Snellville, GA 30078
(678) 344-3104