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I have 2 of the 16 foot with same hull as the Nauset. One has a 2-stroke 90 hp Yamaha, the other a 70 hp two-stroke yamaha. The 70 is almost new as it was a leftover and I bought two years ago "new". It is very quiet and pushes the boat at good speed with 18 gallons of fuel and four people. It does use more fuel than a four stroke. The boat with the 90 hp is very fast. I have only run it by myself, so I cannot give feedback about the performance with a load, but it almost seems like more than you need unless you are really into speed. I allow my kids to take friends out on the one with the 70 hp but I would be nervous letting them on the 90 hp.
Even though I am not in the market to re-power either boat, the F70 sure seems like a great fit { the 4-strokes were a little heavy for my liking when I pulled the trigger} Having read about the E-techs, I would think the 90 hp would be way more than needed.