I suggest a fiberglass boat for Sakakawea. Aluminum works fine for small lakes and rivers. My opinion is Rangers are great for fishing but are squirrely going fast. They run similar to bass boats with rear of hull only in the water at higher speeds. Rangers are the current trend. I run a 21 foot Warrior. Great boat but heavy. I like Skeeters, Lund Glass, Yarcraft and Warriors. I believe you will be happy in any fiberglass boat. You may want to purchase a used boat to start. Depending on age, may not depreciate much and you can move into something newer or new after a year or two. The newer 2 stroke and 4 stroke engines get amazing fuel mileage versus older models such as EFI. Bargain fiberglass boats are Sylvan. StarCraft, Stratos and Larson. Friend runs a Sylvan with 150 Yamaha 4 stroke. Runs great and he catches as well as anyone. Boat is a great tool but many other factors that lead to successful fishing. Walleye Central and Bismanonline are nice sites to shop used boats. Fall and winter are better times for deals at dealerships.