Personally, I like this series of questions on how/what to choose:
http://www.hobiecat.com/sail/help-me-choose/My recommendation is to decide the boat that you want using the help-me-choose questions and then look at how things rig and see if the steps in rigging fit your time and location. How does the main sheet attach? To the boom with an S hook? When you are bouncing around in the surf, it a trick to put a pin into a D shackle that attaches the main sheet to the boom. Solo it is almost impossible. With an S hook it is a breeze. Just clip it on and go. How does the mast step? How do the rudders attach?
To me, the biggest problem facing racing cats are the strange little rigging problems. And racing cat enthusiasts NEVER talk about those kinds of problems. What I believe happens is that those who start with the faster line of racing boats (not just Hobie Cats), get really tired of these problems, burn out, and give the boats up. The racing cat people say, hey, that stuff is not a big problem, just join the club! That kind of attitude is killing racing, in my opinion.