We use a Minn Kota 70EX (extreme series) for a kicker on our 16.5' Alumiweld. 24-volt system, lasts all day, and provides plenty of push. Unfortunately, it's in the shop right now (bad switch board). I would go with the biggest lb. thrust that you can get for your sled. If there is a bigger one, get it. It never hurts to have the extra power.