We want a boat for a quite windy lake (20 mph is common, very popular with windsurfers) that is "family friendly" -- it will be very hard to capsize and is easy to rig. The lake is quite cold, and I have children 3, 5, 7. I grew up sailing on 420s, windsurf now, but don''t know anything about a boat that would handle 2 adults and 2 kids, but would be very stable. I don''t want a "big" boat (lake is 1 mile by 5) so I''d also take a boat that could handle less people, but is still stable. We have a dock, so keels of 6 feet or so easily handled. Suggestions welcomed!