Well, it seems a little like going from Presbyterian (PCUSA) to a PCA church or from American Baptist to Southern Baptist. Along with a little less overt esotericism, I would like to get a closer look at what appears to be a more conservative jurisdiction.
Well, I think going to an Ethiopian church would satisfy your search just as much. From what I can tell, there are 2 if not 3 Ethiopian congregations all significantly closer to the center of Atlanta.
I found the website for one of them: http://www.kmariam.org/
I hope some members of the EOTC could add some information.
On another note, has the OO officially accepted Jesus' two natures? This is very important to me.
It really depends. "Nature" has turned out to be a rather vague term Christologically. If you explain what it means for Christ to have two natures to you, I could answer.