From my times there it seemed that the winds tended to be upstream or downstream (or not much wind). I would think you would want a smallish boat that performs very well with an easy to use spinnaker system. I don't know candidate boats well enough to recommend one, but something with a self-tending jib would be good.
Heading back to Lake Ontario for this summer. Ainia is back in North America for the first time since 2010. Currently in Long Island Sound.