for rebuilt seems really high , I was quoted 4000 euro for a brand new Volvo penta
with new gearbox
Usually rebuilds in Greece
at least never go over 1000 euros for bigger engines , maybe you check with a different mechanic
? A small 2 cylinder engine rebuild
shouldn't cost so much .
Now about the options you have ... A good rebuild engine
is almost like new and it will save you from.the trouble the used one might have .
Check the prices around .
P.s those engines are so easy to rebuild they can be rebuild without pulling the block of the boat
.(depends.on your damage )