I know this post is almost 2 months old, but i'm in the same boat.
I'm moving to N. Atlanta in a month, and i'd love to meet up with some riders.
Filman, not sure where on the north side of town your moving to, but find your local sorba group, probably Gwinnett or Gainsville, go to one of the meetings or group rides and introduce yourself. I guarantee you that you'll have all the riding buddies you care to have. My experience is that the mountain bike community around here is the nicest bunch of guys and gals you'd want to meet.