I'd put in another vote for the Flyzone Tidewater. VERY accommodating seaplane and her surface handling makes water action very enjoyable. I did put a slightly larger ESC in mine (from a Hadron), but friends fly them right out of the box with no problems. We had a float fly last weekend and I finally got up the courage to try the "Tidewater Tumble" and, happily, taught myself how to enter and - more importantly - exit the tumble. Opens up a lot of fun opportunities. With a bit of rudder to enter the tumble it will also do a "knife edge" spin - which is kind of different and also entertaining.
My favorite float plane is the Carbon Z Cub. "Plenty of power" is an understatement. With a 6S 4000mAh battery it will hang on the prop, with floats, and pull up out of the torque roll. WAY more than scale power, huge control throws . . . and it tames down to a kitten when you ask it. Very wide envelope. As BladeBender says: "Lands like a feather". Takes off in two float lengths from stopped on the water into a 6 mph headwind. What a hoot!
Get one of each!
Note that in this vfirst video the wind was in my face and I'm standing on a tree-lined shore. Had to land in a 15 mph crosswind - and not perfect but pretty good!