A little more background on what you will be using the boat for would be helpful. How far offshore and your own experiance in boat handling are major considerations as a novice can soon get a 30ft boat in trouble where experianced rescue crews can work out of tiny boats.
You mention 12-14ft chop-swell, which do you mean chop or swell. 14ft chop will be uncomfortable in most boats but 14 ft swell depending on the distance of the sets can be almost unnoticeable.
At my local bar crossing we have several fatalities per year as well as many capsizings. When the going gets really tough it's the 4m ribs that do all the rescues as the bigger boats are useless under extreme conditions.
Not sure if you intend heading out in bad conditions but when the weather turns bad 99% of the time we have been warned via the radio forecasts first. A strong gale can also be seen approaching and normally takes a while for the ocean to become dangerouse (enough time to get home or take shelter somewhere).
I fish anywhere between 20-50nm offshore in the Pacific Ocean where large ground swells travel for hundreds of miles.I would rather be in my own small 550 pro than the 8m dive ribs I work on, just because of its light manoverabilty.
Depending on sea direction a game plan of alternativ harbours is always part of my plan, rather than fight against the sea I work with it.
This is my local bar crossing on a good day with a 6ft swell.