Just a little heads up to you guys - having lived in DC - regarding how expensive DC is versus Atlanta...
I lived several blocks away from GW in DC and was 1 of 7 people in a stand-alone home that had only one garage and guaranteed no other parking. My rent - without any utilities - was $900/month.
I now live in Atlanta, in one of the nicest, most popular neighborhoods that is 5-10 minutes max from Emory's SPH. I have a stand-alone home, a yard, a driveway, free street parking and I only pay $575 a month.
This is just my opinion, but from everything I've heard, Emory seems to be a better SPH, overall, and Atlanta is a much friendlier city to your wallet. I think DC is MUCH, MUCH more fun city but I'd find it hard to justify spending that much as a grad student with financial aid when I could kick arse at Emory for ~two years and then get a job in DC that would actually pay me enough to live there!
The one expense you'd need to consider in ATL is a car - which may or may not offset what you'd pay in additional living expenses in DC. With that said, the bus system that connects Emory to its surrounding communities is reliable and many people use it.