My wife and I loved Love - the Beatles themed one.
I have seen Mystere and O a couple of times and they are both great, with O having a bit more wow factor.
Zumanity can be fun, depending on how open minded your group is. It would be my fourth pick.
I have not seen KA, but have not heard anything good (from locals) about it. I know 2 couples that walked out.
Thanks
Rick