I didn't rush when I was a freshman and decided that I was going to rush as a sophomore. I thought that I knew which group I wanted to join and almost didn't give the others a chance until I realized that I wouldn't have fit in as much as I do now. It turned out that I didn't even have to go through formal recruitment because I was extended a bid through COB. Looking back on it now, I am so glad the light went off in my head and told me to consider the group that already contained all of my friends... Kappa! It was the best decision I ever made!
ETA: We also have deferred recruitment, not as sophomores (but sophomores can rush), but during the winter term of our trimester system (so january) and this also adds to the problem of many girls going in with a set mind on a particular group and some girls being heartbroken! IMO, if you look at all the options and give each a fair chance, you will probably end up where you belong... and it will be a great experience!