You wouldn't go wrong choosing one of the BWM range, there very stable Ribs in a chop, with a large carrying capacity and scope for different configuration, they can build with your own design preference if necessary.
BWM Ribs - Sports Rib Range
Personally I'd choose the Crusader 10.
BWM Ribs - BWM Crusader 10 Sports RIB
But there all top class designs tbh, guess it just depends on your needs, what you will get is the very best of British made quality
BWM Ribs - BWM Sabre 8 Sports RIB
There's also some great second hand BWM deals around, many configured for commercial diving etc,mainly because of the massive available deck space and outstanding sea keeping qualities, but it wouldn't be hard to transform them for passanger requirements, Ullman style seating and bench seats would be easy to fit on there solid deck.
You won't find many 2nd hand for sale though as many owners are happy to keep them for life, when they experience the sense of safety and stability thats achieved with there design. by chance I have one for sale, but only because i'm looking to downsize, due to the narrow roads round my way.
All the best with whichever choice you make.