I reitterate what the previous ppl have said.The best sorority is the one that best fits you and I am sure that it will definitly happen to a person like you who seems very passionate and enthusiastic about rushing.
Going Greek was the Best decision I have ever made. It helped me to become more outgoing,confident and determined in what I want to do in the future after college.Leadership is very important in Chi Omega particularlly.I feel so proud to be Greek,let alone a Chi-O. Just people who ask me what sorority I am in and when you say Chi-O.They like "Ooh wow I know a Chi-O" OR "Those Chi-O girls have a great chapter at our school, just all around wonderful girls".You feel soo special and it makes you feel glad in knowing you made the right choice.
Just remember "Be yourself" and cherish the whole experience.It is something to remember.Once again Good Luck and Keep us updated.