Thank you for all of the help guys - I've definitely had a lot of great conversations about how sorority membership is for life, and that seems to be something that all of the sororities really support!
I was invited back to five houses out of a maximum six for sisterhood day yesterday, so fingers crossed that I'm going back for pref night today!
I have two favourites at the moment, but I liked all the houses I went back to yesterday, so I"m keeping an open mind