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Thanks for all the advice. I am going to order the recommended spitfire prop, 48-8M8026560, 13.8" x 11"p. I don't want to spend the $$$ for a stainless prop for occasional use. The spitfire comes with the hub kit so it is not much more than the Michigan Wheel. Top speed is not an issue as the kids don't like to be pulled full speed.

I love the Montauk 150 it is the perfect boat. Keep it small, keep it fun, right?
My first Whaler was a '04 130 sport, great boat but we outgrew it. I pulled a tube with it, one kid. I then bought a '91 25' walk-around, way too big and I did not keep it long. Then I bought a 20' Ventura, great boat but a lot of work to take out alone. I had it for 10 years, sold it for more than I paid for it and almost enough to buy the Montauk 150. I wanted the 170 but it wouldn't fit in the garage and I didn't want it to end up weathered like my Ventura from sitting out.