Hi mate,
I am sure Huey will reply by tomorrow morning. I have had nothing but two strokes and personally for performance I love them. I have had friends with four strokes but I like the punch.
I have had Mercs, Johnson, Yamaha and an E-tec.
The E-tec was the more modern one so of course I prefered that over the other models. From what you are telling me, 1000kgs, I would personally go for more than 60HP.
My E-tec 150 was fitted on a Tournament 2000. I thought the 150 wouldn't be enough. It pushed the boat with two people at 75km/h. Hole shot was awesome, was on the plane in seconds. I would of still wanted a 200 though