Re: 17 foot 3.0 vs 18 foot 4.3?
I have a 3.0 in my boat. I dont have the bench type seating at the back though. That would be my only concern. It's a bit tight with that arrangement on a boat. I had my boat loaded with friends (5 adults from 120 - 180 pnds, and 3 kids), and i had no issues with getting on plane or hole shot. The reason for that is that I put a "high five" prop on it. It made such a difference to the boats performance. I had to sacrifice a few mph at the top end, but i never drove full throttle anyways. It made all the difference in the hole shot though.
If it were me, i think i would do the 3.0 again. Things are expensive enough as it is, and saving money in fuel costs are a huge bonus. My friend has the 4.3, and he goes through a lot more fuel than i do.
By the way, i have the back to back seats with the seats beside the engine cowling. I also use my boat as a fish n ski. I pull tubers and skiers all the time...however,a slalom skier has an extremely hard time getting up, and more often than not, we opt to drop a ski because the slalom guy cant get up due to lack of power, not skill. This might be a different story if i had a tower.