When I made the transition from racing lead mines to cats, the most helpful book I found was Rick White's Catamaran Sailing for the 90's. It is still available through this web site at the online store, click top right here. There is a separate chapter on several different boats, and a separate chapter on spinnakers by one of the best, Randy Smythe. While you wait to find your new toy, I would recomend you get ahold of that book and read it thoroughly, twice.

The rules are the same as mono's, the physics are the same, but the apparent wind thing going downwind is going to blow your mind. The book will help you understand what is different and how to prepare for it. Do not get discouraged when the others leave you in their wakes, just bring them a beer after the racing is over and they will tell you how it's done. When you get to Florida come to some of the local regattas and look at the cats, talk to the sailors. That is the best way to shop.