I can highly recommend the Nacra; it's extremely stable compared to the Hobie 14's and 16's I rented, in terms of pitchpoling. It's also faster (even with just a uni sail!) than those boats.

At least, that's the impression of a relative catamaran newbie

Only downside: I've heard that Nacra models before '85 are a bit heavier, and maybe harder to find parts for?

This site has some good information for 1st time catamaran buyers:

http://www.sailingproshop.com/Catamaran.htm

-Aaron