prindle 18. no boards and plenty of hull volume.

The only reason i wouldn't really recommend a TheMightyHobie18 is they carry resale better than most cats and always seem to have fiberglass cracks around the front crossbar. That is unless you spend the extra change to buy a nice example or an ~88+ model, which are kinda uncommon.

a Nacra 5.7 would be a good choice as well. No boards and similar performance as TheMightyHobie18.