You could always save weight by going with a hand control.......
But personally, I'd put the trolling motor that you like best on the boat, and not worry about weight. Mount it on a removeable plate and pull it off when you aren't using it, and then the weight isn't an issue for play days.
I spend the majority of my time on the water running the trolling motor, so I won't skimp there or mount one that I'm not completely satisfied with, just to save weight.
With an 03, a 60-70 lbs thrust trolling motor is plenty, in my opinion.