My understanding is that the Briggs is basically a fresh water motor only, and a throw away. I seem to have read that they vibrate quite a bit but have no first hand experience.

I have a johnson seahorse 2 for my dink, which is the back up the Yamaha 6 that powers my boat. I doubt I would go fast, but it would beat having to row if the motor gave up. I read that are looking for more power.

I might recommend you think of the dink motor in those terms, and even go so far as making the shaft lenght one of your considerations.

I purchased a British seagull as a gift for a friend of mine. I was impressed with it, and they have a wide international following. They are simple as dirt, and easy to fix. If you search on this forum, I think there are about 3 threads that mention them, but two are from someone who did not have much luck with them. That seems to be the minority opinion though.

I came across a link that gave lot's of info on Seagulls, let me go and look for it.