There are loads of them around here. The build quality performance in bad seas is nothing compared to a Humber. I have a 5.3 Humber Assault which gets quite a bit of criticism on here for its sea handling but you need the Narwhal 5.8 to get any where near it in a bad sea !
For 4k you can find Humbers and Avon Seariders. In France British made ribs have a great reputation and when I compare them to Zodiacs and the likes you can see why