the best in atlanta is Mikaels Auto Spa in Sandy Springs. Best Price and best job esp on Bimmers.
http://www.mikaelsautospa.com/
He had an M3 for a long time and still has a BMW. I have been using him for the last 15 years and i never take my car anywhere else. He does a super high end detail on my M3 once every 6 months for about $500 and once a week a wash for like $20. he is the best!!!