Molly, don't feel guilty about not liking certain houses. There is ZERO point in joining a house you won't feel comfortable in. I've been in your position and I can tell you that sometimes it's better to be independent than be in certain houses, depending on what you're looking for.
UF is a very status-oriented campus - both politically and socially. If you're not in the right house you will have trouble getting involved on campus and will automatically be judged. It's a lot to deal with. And let's be honest, the social part is part of why being Greek is so fun. Sisterhood is #1 of course, but if your house is not invited to things and you have trouble filling your social calendar, it wears on you and eventually the rest of the experience can be dulled. UF is not like a lot of campuses where every house is fine or some are super elite and some are just fine. UF's sororities are all pretty "elite" with a small handful that are just viewed as "weak."
Regarding Chi O, I am truly sorry. I thought I would fit in there really well too - I knew 4 sisters really well from high school and just loved the house. It was devastating to be dropped. And I know someone here mentioned COB - but Chi O doesn't ever rush in the spring or bother with COB. Sorry to be so blunt, but I always think it's better to know than get false hopes.
BUT REGARDING KAPPA - I HOPE YOU MAKE IT! They're great. I know that sometimes they don't come across as "sparkly" during rush, but trust me, they are really sweet girls. The reason you may have been more impressed with Chi O is because almost all their girls are REALLY outgoing (almost to the point of "ok, enough caffeine for you!" haha) but Kappa's sisterhood is just as strong. They just have more laid back girls. But they are all down to earth, real people, which is important. Some of the sororities at UF have a great "reputation" and are viewed as "creme de la creme" but unfortunately have problems with sisters being bitchy and fake. That isn't the case with Kappa.
Best of luck with everything. Things will work out for you.
Go Gators!
G8Ralphaxi