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Arizona......finding a good local dealer sounds like it is tough. Sounds like you may have to take a road trip! I would go to the top end of the HP rating since you want to tow boats and a skier. Looks like 150HP. The right prop will make a big difference. Call Phil T's prop suggestion for advice on a good pulling prop. I guess you can look at it two ways, since it is a business boat, do you need to keep cost down or pay a little more for hopefully better reliability. Yamaha and Honda are what I would consider higher end motors and you are going to pay more for them. I noticed Seatow in Charleston has switched to Suzuki. Good luck. Set up a personal page and show us some pictures of your Guardian.