thinking of joining a sorority

Hey, I'm currently a freshmen here at MSU and at first was totally not for the idea of joining a sorority. After seeing everyone do rush week and meeting girls in sororities and hearing everything they have to say about it I'm kind of leaning towards rushing next fall. (My sophomore year) I was wondering which sororities would most likely take a sophomore candidate? Also was wondering how much of a financial investment a sorority is?
Thanks!