I have a choice of a used 2001 25hp merc 2 stroke or a used 2009 20hp merc 4 stroke. 4 stroke is $400 more. Weights are the same 114LBS. I will be putting this on an 14' alum v hull. My johnson 9.9 just doesn't have enough get up and go. I currently use a electric trolling motor, my wife hates...