We're not far from you... if you are up for a drive you should come by and hang out at the shop one Saturaday.
Z1Motorsports.com - Nissan 300zx, 350Z, 370Z, Infiniti G35, and G37 Parts and Performance Experts.
As for car clubs...there is really only the Ga Z Club in our area. Robert is the President of the club.
Georgia Z Club - Home
They sponsor alot of Z Car events and other social type events throughout the year.