[Pipe_Dream]

My V-20 had a 155 Evinrude that on its best day pushed the boat to maybe 37-38 mph, with no load and an absolutely clean bottom (and a tail wind ;)). I replaced it with a Yamaha HPDI 200 hp that took me to just under 50 mph in nothing flat. My 155 was a great, miserly engine: I never burned more than 7 gph. But add several people and/or a few months worth of bottom slime and forget it. So it really depends on what you want to do with it, what loads you will carry, and whether the bottom stays clean!