There are four places nearby that rent boats - not saying they rent what you're looking for but calling around to boating shops would be a good bet. In our case one rents NRS and Aire, the other stars (or rebadged versions there of) The fourth is a little farther but they rent a variety of brands. None, however are cats, all rent round boats; I'm not aware of cat demo's. With that said, Sotar advertises demo boats for sale for instance, so they must demo boats in some matter. I'm sure if you were in the area they'd hook you up, as would Aire, NRS and Maravia I'd guess. All you'd have to do is ask (and leave a deposit, I'm sure).
In my case, I had a pretty good idea what I wanted - at least I knew exactly what I didn't want and I asked a lot of questions here and ultimately made a $5500 educated guess. It worked out splendidly for me.
I think as long as you know what you don't want, and know what causes the undesired feature/attribute/whatnot then you won't end up unhappy with your purchase. Unless that is, you buy a Scadden. Real boats are tried, true, tested and vetted by other users.
The last thing I'd warn of is to not waste too much time over thinking it. Certainly don't waste a season wishing and washing because what you will regret, is the time lost on your new craft, whatever it ends up being.
"If you dont do it this year, you will be one year older when you do"