My ideal boat would be very close to the design of the Westsail 32. This is, of course, an Archer, Atkin, Crealock, derivative. Having sailed over 150 boats over 160,000 miles I have found nothing better for what I want to do. By far, most of my experience has been on fin keeled boats. Some cruisers, some racer/cruisers, some racers. As I prefer a smallish boat I have found that when doing long distance voyaging, carrying all that is needed, that none of the modern boats will perform as well as the Westsails in the size that I want.
Admittedly some boats do some things better but none are as well rounded in performance as the Westsail. I am not interested in going larger.
With all that said, My ideal boat would be built using newer materials and more modern equipment than Westsail used 30-40 years ago. Improvements in rigging
materials and coring materials are examples. The rudder would be attached with a thought toward hydrodynamics instead of just ease of construction. And a modern, retracting, bowsprit would be handy.
For living aboard,( I did for 26 years), the interior was perfect for a couple. For voyaging, I found the center table option to be ideal, as great sea berths were perfectly located.
Using the newer building techniques and materials, I would reduce the unladened weight by about 1200 pounds but keep the designed ladened weight at 19,500 pounds. I would not add coamings to the cockpit area as many people have requested. I prefer the complete ease and freedom of movement from this area.
For the high latitudes I admit it would be nice to have a 39 footer but at all other times I like the shorter boat.
Why a full keel heavy boat? Because both attributes can produce a level of performance, safety and COMFORT that can not be attained in lighter weight boats when doing the kind of sailing that I am usually doing. And what am I usually doing with my boat? Whatever I want to do.