Get a size 27 deep cycle marine battery for the best bang for the buck. They can be had for around $75-100 but you do get what you pay for. No need for an Optima battery for a small boat. As far as trolling motors, Minn-Kota is the way to go. I have used Motorguide and Minn-Kota and Minn-Kota seems to be a better option (at least for me). I have a spare Minn-Kota 30lb. thrust that I would be willing to sell since I just got a more powerful motor to fish with a few people in the boat. Are you looking at a transom mount (back) or bow mount (front)? Is your boat more like a utility/jon boat for carpeted and finished? That all plays a factor as to what kind of motor you need based on boat weight, gear, people, and fishing location. I hope this helps and feel free to PM with any questions.