we just did one a few weeks ago for another diving club. They took the Honda 115 and happy to give you silly prices on these and bigger engines. oh if its commercial you get 2 years warranty as standard.
also have there 2nd hand one in if you are looking for something cheaper (135hp)
We use the Yam 115 four stroke on our dive boat. Great engine, but depends on how heavy you want to stick on the transom? Getting just under a litre per mile at 24kts.
Had to reduce the pitch down to 15 inch to obtain the revs with 6 divers & kit though.
I'm sure you can get a low hours engine for that sort of money?
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll