I am staying at the Hotel Indigo in Midtown Atlanta. It is 1.2 miles from the convention or about 6-7 blocks. The rooms are about $175 / per night if you book through their website. I booked a vacation deal through Priceline and it was apparently only about $300 for four nights.
I would love if more Ghostheads decided to stay here we could share money on Cab fare.