Ring is fine
John,
For your purposes the Antal rings are perfect. The bend radius on one is far grater than say, a carabiner, which strength-wise, would still be strong enough. Unless you're suing ridiculously thin Sta-set (like 1/4"), your preventer is not going to feel itself strained.
It's easy to get tied up in knots worrying about ultimate loads and percentages of breaking strength and bend radiuses, but all that applies more to folk who are trying to shave as much weight and windage as possible, such as the ever-obsessive racers. On a nice, heavy, low-tech cruising boat such as yours, I suspect all the lines are comfortably fat, for ease of handling, and you're not pushing any material to the extreme where a bend radius would be life or death.
Use a ring. Enjoy your life. Cruise.
Ben
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