My choices:
Phi Mu, because of many of the reasons that Honey and other ADPis have listed, and because I am simply so familiar with them. Also, their chapters do extremely well in just about every Southern campus they are on.
Kappa Delta. They truly are "KD ladies" and I had many KD friends in school. Love their Girl Scout work, and again, their Southern chapters are very strong everywhere. (I am SO excited that they were chosen to colonize at Georgia College and State University-they will be a perfect addition to the already very classy and strong Panhellenic group there.)
Zeta Tau Alpha. Strong Southern chapters, philanthropy, and yep, gotta love those crowns! (When I was in school, early seventies, I don't remember them doing much with the crowns at all-they were more known for the strawberry thing.)
I will also throw in Kappa Kappa Gamma-colors, symbol, strong down South-(and don't we all just love the sound of "Kappa Kappa Gamma"?
) And Alpha Xi Delta, because of receiving my daughter's Quill here at the house-they seem to have a very different "slant" than ADPi and others I am familiar with. I mean this in a complimentary way, obviously, and I can't put my finger on what it is exactly, nor explain it. But it's all good!