Outboard
Sorry for the late post, but just in case you haven't made your purchase yet. I see you are in Venice, FL. and having done some diving in that region I have a recommendation for you. It isn't a matter of how much Hp you have, it's the delivery. Any outboard of 4hp or more will move the boat fine, you will need a extra long shaft to do it well on the gulf coast. I have two outboards for my 23, a Johnson 8hp 25" shaft for coastal work(more than I need), and a Honda 2hp 4 stroke 20" shaft for inland lake work(I love the quiet, easy starting, and it only weighs 28#). A 20" shaft will not be long enough for coastal work, especially is the conditions are less than smooth.Best Wishes,Brian