Ed:
You may also want to consider investing in a 4-blade prop, or a mid-range 3-blade prop. You'll lose some top end speed, but your hole shot and pulling power will make it worthwhile. You'll also (very conveniently) have a spare prop just in case you hit something submerged and damage your fishing prop.
The Merc 90 apparently is the popular motor of choice, and I certainly envy your fuel economy over the 150. Even Ken tried to steer me clear of the 150 when I was doing my research in advance of buying the boat.
But I'll tell ya'all this: There's this certain boater I know who tried talkin' me into glass because of speed. He thought I would be making a mistake by going aluminum, and making a double mistake buying a Tracker. This spring, there will be that day when we'll be on the same lake and we'll both mash the throttles, and I'll regret not taking a camera along when I his face as I pass him. Thirty extra horses and a better prop should be enough to outrun his waterlogged boat, eh?)
Of course, at the end of that little demonstration, I'll wonder if it was worth not taking Ken's advice as I re-fill that 42 gallon tank! LOL!