Re: what size outboard
Size, in terms of physical dimension & weight, or hp?
Your boat would do good with a 15-25 hp motor. Depending on what your use is and how loaded you are. It's a fairly narrow beam, so i'd say go with a 20, assuming your boat is rated to handle 20 hp - does it have a coast guard decal that states the maximum hp?
if you run with 2 friends, gear, dog etc.. go with 20-25..
if it's you and wife, you and a dog.. you and gear.. a 15 is adequate and a 20 would get you ripping around a lake for sure