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For around 10.5K purchase price, you should look at the new Mercury 150 EFI 4-stroke. It is the biggest displacement of any, 3.0 liters, and the lightest in weight of all the 150 4-strokes. It's probably about a 170 HP engine at the prop. Your boat needs a 25" engine, and can easily handle the weight, since the boat was designed for 90 HP 20" twins, close to 550-600lb in weight.

For the ultimate in speed and if a 2-stroke would even be considered, look at the Mercury 175 Pro XS Optimax. Close to 200 HP and a real screamer. Price is about 11.5K, and it weighs about 20# less than the 4-stroke 150.