How did I forget Westerbeke in my post above. While big in marine diesel generator's, Westerbeke's position in small propulsion engines had diminished. But they still are a significant player.
You need to research the EPA regs for a new build. It used to be that marine diesels under 50 hp were exempt from the Tier 1,2,3,X regs, but now I don't know. I realize that the Bahamas may not care much, but you probably will need to source your engine in the US and they won't carry an engine if it doesn't meet EPA specs.
Maybe a better way is to look for a used sailboat engine. Bayshore Marine, Mac Boring and others rebuild Yanmars to near new specs. You could get a rebuilt one shipped to the Bahamas, but check for customs restrictions.
David