ok, after years of paddling around my favorite lake(Lake Texoma) on the Texas/Oklahoma border, I am finally ready to purchase a new outboard. I have a 10 ft. johnboat, rated 15 max. Being a poor college student, I can only afford the cheapest outboards available. I'm looking at 2-4 hp. My local dealer has 2 Yamaha, 2.5 Mercury, and a 3.3 Mercury. What would you choose? Will there be much of a difference between 2.5/3.3 hp? Any help would be appreciated. Thanks.<br /><br />John