Although I didn't go to UW, I have visited the Kappa house there on more than one occasion and had opportunities to meet the sisters, who were all outstanding.
UW is a very liberal, diverse school. I think in general there's a lot of acceptance both in and out of the Greek system. With 36,000 students, you're bound to find friends. I don't know about the other sororities, but I will tell you that the Kappas were many different shapes, sizes, and colors. I guess they were a stereotype for not being stereotypical
Are you headed there in the fall? You're bound for a great time. Madison is a terrific city with lots of fun things to do. (Are you from Wisconsin?? I went to college there in Appleton, at Lawrence University.) Good luck to you, and when you get there you should eat at Noodles on University Avenue.