I had a kite boat for a while and tried a lot of different kites. I had the best luck with a small LEI (3m trainer). I also used a close cell foil
which worked well enough. These are also the kinds of kites kitesurfers use. Water relaunch is important, and boats will drift downwind more making
relaunch harder. The boat you are talking about seems ideal to me. No matter what - bring a paddle* along when you start. If the kite gets
waterlogged you may need it to get back to your launch.
BTW - you don't need a kite as big as the kitesurfers use. Use about half what they would be using according to Peter Lynn.
*Unless you have Hobie's drive already.
NPW Test Pilot -US99