Could somebody help me make up my mind please on buying a new 5.5 rib and engine size?My first preference is Yamaha as I had them before.Firstly 80 hp four stroke at 164kg or 70hp 2 stroke at 105 kg.I understand fuel consumption is a serious consideration but how about speed and torque and how lively it will feel?Is there good up and off with a four stroke on a 5.5 with 80hp?I would assume that 60 hp 2 strke is too little for a 5.5 bearing in mind my last boat did 37mph with a 50 hp 2 stroke on a 4.8 m.I am trying to get the best set up so I need all the experience of the wise ones on the forum!