After looking at the Minn Kota site and selection tool, I think I could get by with the Endura 55 or Traxxis 55. They both use one battery. I could step up to the Traxxis 70 for more power. However, it uses 2 batteries. This singificantly ramps up the cost because I will need to buy two batteries and a double charger. That said, I'd hate to buy the smaller one and find that it did not have enough power.