Best Authentic Indian Restaurant in Atlanta Area?

What Desi (Indian, Pakistani, Bangaldeshi, etc.) restaurants in Atlanta area would you consider to be the most AUTHENTIC ones? I am tired of the typical Americanized Desi restaurants and am looking for real authentic food. I don't care if they don't look that great. Afterall, isn't the best food even in India always found in road side Dhabas and small joints?
Additional Note: I am more specifically looking for restaurants that make spicy and authentic Chicken dishes.

Udipi, Madras Saravana Bhavan, Bombay Palace, Chat Patti

http://msbatlanta.com/
http://www.udipicafe.com/udipimenu.htm
http://atlanta.citysearch.com/profile/3023410/?brand=smx_restaurant-nc
http://atlanta.citysearch.com/profile/35414384/?brand=smx_restaurant-nc

Bombay Grill on Savoy Dr. was good. Rajas in Buckhead is good, but mild. Bombay Palace is good as well

Ashiana in global mall, Armaan in Duluth, Bombay Grill on Savoy Dr, Bollywood Masala and Madras Saravana Bhavan

Vatica
Sarvana Bhavan