A good choice would be the 74# like you said you like to fish the rivers and it's a 7 mph current there. You don't always have to turn it on full power so don't think it's to much. And when you want warp speed it's there. 24 volts the way to go. That's a big boat you have and you won't be disapointed with the 74#.
h2o<---says that's what i think.
h2o<---says that's what i think.