We're shooting for bigger! Dad wants a 50 footer with diesel power. We could handle something like a Yanmar 4 cyl diesel in our current size boat but I dont know about mating to the sterndrive or actually finding one for a reasonable cost...
Yeah, my engines are more typically used in 90-175ft fishing. Bottom of the range is ~1200hp, largest version is ~3400hp each. I don't think the top range, larger engines are used in fishing. I think those engines are mostly used in tugs, crew, and passenger boats.