Hello to all! I have a 19' Sabrecraft with a 150hp Merc outboard. My family and I love to fish, so I would like to get a trolling motor. Problem is, I haven't the first clue what size to get. I've been looking at three different motors: a 5.5 hp Johnson, a 9 hp Evinrude, and a 4 hp model made by Chrysler way back when. I'm not sure what hp would be best... any advice would be greatly appreciated!<br /><br />-Steve in Idaho