Ok, even though nobody is supposed to talk about this and if going through rush you should pick the house that to you feels like home which is very true.
If you had to pick the sterotypically "elite sororities they would be (maybe not at your school but overall)....
Kappa Kappa Gamma, Kappa Alpha Theta, Delta Gamma, Pi Beta Phi, and Delta Delta Delta

No, they are not always "the best" but we're talking about sterotypes. Sigma Kappa and Alpha Phi are also popular in a lot of places. The orgin of these sororities being concidered elite over others would be that they were started the earliest and all of them helped start Panhellenic council. However there are 26 sororites in the PHC and all are wonderful organizations. Thanks -GG

also- I was just speaking in terms of the PHC sororites here. Sorry to the NPHC and locals. I just don't know a lot about you.