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. Now in Bermuda and heading to Long Island Sound in the first week in May. Then on to the Hudson and the Erie Canal.