ok, NOW we're off topic. My best ride of the summer was at 8 degrees C (46 F)and howling, and I had a full wetsuit (with hood) which was fine. The drysuit doesn't come out unless it's snowing.
Sorry, I don't know much about the Twixxy or wave; I would suggest a Hobie 18 over a 16 for sure for what you plan on doing with it. Good luck.
Al