Congrats on the car from a fellow ATLien. I have a post going in the Southeast regional forum for Georgians to check in.
There is also a few good facebook groups to join, Atlanta Z3/Z4 Owners (
https://www.facebook.com/groups/AtlantaZ3Z4/) and ATLBIMMERS (
https://www.facebook.com/groups/ATLB...target&fref=nf) are Atlanta specific and ZSCCA (
https://www.facebook.com/groups/zscca/) is a general Z owners group.
Beautiful color by the way. I'd say the 1st mod you might consider is M-Sport seats. They are unbelievably better than the comfort seats, but i believe they are expensive to retrofit. Other than that a cheap start is a stubby antenna. Congrats on the Z!