Currently being produced does not have to be a criteria.

So, possible single handed classes are Waves, Weta,s Hobie 14... (Still an active World Sailing Class) and Isotopes. I believe all of these classes have a nationals in 2016.

Active sloop classes are Hobie 16s 18s and 20s.

Active spin classes are F16s F18s and of course the N17. I don't think the Nacra 20 or any of the flying boats get a critical mass of 10 boat to an NA's. The pending redesign of the n17 could make thinks problematic tho.

Lots of good choices tho.