I am indeed in at least this general neck of the woods... which is to say, I am within the city limits
It seems that most "Atlanta" people are not actually in the city or even inside the perimeter. That is probably one of the main reasons that there hasn't been a lot of interest in get-togethers around here. Douglasville is not exactly local to Cumming, or Stockbridge to Acworth.
In any case, I am indeed still building. It's been a long time going... In terms of budget, I think it's hard to estimate for a variety of reasons - some of which Tim highlighted. I have lost track of my spending long ago, but I think I am in general on the budget I had set for myself after I got good and started. I initially thought I could do what I wanted for 15-20 thousand dollars. After I got about a year into it, I realized it would probably be 30. It might creep to 35, but I am no longer tracking. The way I figure, you should look at it like a major recreational investment. What would you spend for a boat, or a pool or an extra car? It could be anywhere from $5000 to ten times that, depending on your tastes and expectations, as well as you willingness and ability to save by doing it yourself. If you are the sort to want a new BMW, you'll probably spend that much on a theater. If you set your sites on a 10-year-old Miata as a super investment in your leisure, you might get away with the same budget for a theater.
As Tim said, if you have some ideas (priorities, constraints, an approximate floorplan), you can post and get lots of feedback and guidance.