PDK would definitely be the closest to you. Advanced aviation has a da20 and a 172 out there for a reasonable price
http://www.advancedaviation.com/ I've rented from them before and always had a good experience. Most of the rental outfits at PDK are pretty pricy. One other that I'm aware of that has reasonable prices (but have heard some negative things about) is
http://www.all2flyaviation.com/
I've flown with them a bit and recently joined a club out at LZU
www.flylzu.com
Let us know how everything goes!