The first thing I'd like to say, and also the most important, is "moderation in all things". Especially in the matter of ocean-going sailing boats.
In many books on yacht design, you'll find a comparison between midship underwater sections that are basically semicircular, rectangular or triangular. It's worth studying these texts. Basically: semicircular for minimum resistance, but rolls like a pig in clover; rectangular for greater initial stability but a quick uncomfortable motion; triangular for a good compromise between the first two, giving good speed, good stability, easy motion and load carrying ability but lacking width at cabin sole level.
Many recent designs feature a chine above the waterline, with an underwater shape that might be considered as a compromise between round and triangular. I think this is turning out to be the right way for yacht design to go, and I'm glad that David Thomas and I settled on it as the basis for the design of Tystie, after discarding rounder shapes. It worked out so well that I adopted a simplified form for SibLim. The latter is quite beamy, as she is to be a permanent home (most cruising sailing boats spend far more time at anchor or moored than they do sailing, and need to be comfortable during that time, as well as while rolling down the Trades), and also because she is relatively short - the shorter the boat, the greater the beam should be. The above-water chine allows for a smaller waterline beam, for greater speed downwind, but gives greater stiffness when heeled and on the wind.
So this would be my recommendation: go for a moderate version of Tystie's and SibLim's midship section - chine above water, more or less V-shaped under water, with a nod towards the semicircular section so as not to have too much wetted surface.