What lb thrust do you think would be good for a 14foot john boat. This boat is also thin (not wide) and a flat bottom. I was thinking 40-50lbs. Will be used mainly in creeks and rivers, some ponds, and maybe a lake lol, so all water. Also any other info you would like to fill me in on, with accessories or what not. My dad seems to have it covered, but I'm just looking for other info on it. Thanks.