Will you be sailing alone or with crew?



How much do you (and your crew) weigh?



What conditions will you sail in?



What is your budget?



Do you want a nifty, unique boat or want the same as the masses?



The Mystere 4.3 and Nacra 4.5 are very small boats. I see those as better for kids and teens or strictly as singlehanders for adults. My Nacra 5.0 feels small with two good size adults but is perfect for solo sailing or with a small crew (like my wife or one of my kids).



For your first cat, I'd recommend finding a used cat--there are tons of great options in the 14-16 ft range that can be found used a lot cheaper than a new (or nearly new) 4.3, 4.5 or Hobie Wave.



A good resource is the catamaran buyer's guide at the following link:



sailingproshop.com/Catamaran.htm



Get out on the beach and talk to owners--they'll all tell you they've got the best cat ever made. (I'd be happy to give you the diatribe on my boat...)



Good luck with your inevitable addiction to cat sailing!