We did a bunch of research and Suzuki was it. I was always a Mercury guy. We powered everything with mercury, my dad's old back country skiffs were all powered by merc, and this was in the 60's. They never left him and a client stranded out in the back country.
We re-powered our Whaler last August, went from a 40 to a 50 4-stroke Suzuki. Wow, we use about 1/3 the amount of fuel and actually faster. It took me a few days to do the work, but I got it done.