The new mercs are a nice engine and almost silent. Try calling Barnet marine centre. (BEST UK PRICE Outboard Motor Rib Inflatable Aluminium Boat Package
). I got my 115 merc from them and it was a lot less than their web price, inc delivery and the service and after sales support was very good, particulay when fitting the smartcraft bits. Incidently the 75 90 and 115 the the same engine so if the boat will take the power, go for the bigger engine at no extra weight. I did and its incredible.