James I am sure you will get a lot of responce to this post but you have two shows both on the Solent soon. Here you should be able to test boats in the same conditions some with different engine options, together. If your are looking for new could be a good statring place. If you go to the show web sites you can see whos at each show and book a trip out with them and meet people with boats you intrested in had have a chat. Good luck
Remember It is only possible to live happy-ever-after on a day-to-day basis
May I suggest the Ribcraft 5.3 which takes up to a 100hp engine. It's tough, well-made, small enough to be launched single handed yet large enough to cope with a bit of a chop. Lots of engine and seating options and would suit sir down to the ground.
Slightly larger is the 585 which takes up to a 150 hp engine and is that little bit bigger and faster.
Ribcraft are a very professional outfit building in a modern factory in Yeovil - well worth a visit.