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Hi Ron,
I'm not much of an expert on these types of craft, so can't really give you much advice of brands, but hull shape no problem. A flat bottom will promote early planing and this would be useful if you want to reduce the size of engine needed. The downside is it will be uncomfortable when the chop builds up. A rounded hull will take longer to plane, but remain more comfortable in choppy conditions.
As far as engines go, Yamaha is the ONLY engine I would buy. It's far from the cheapest, but you can't beat the dependability, the quiet sound and the fuel economy on their new engines. For other manufacturers Honda and Mercury also make great engines.
For size, your dealer is the best source. They should be able to size the engine based on the boat your by and is gross weight.
Best regards,
Captain Ian Fagg
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