RE: Good beginner seaplane
If you are not willing to start with a trainer, I can save you a lot of time. Send me $600 (US). Then forget about airplanes.
This will cost you about the same as a trainer and the stuff you need to support it, but it will save you the agony of learning to start the engine, taxiing into the bank while you realize there are no brakes, going real fast and water looping, or maybe getting airborne and having no clue what happens in the third dimension and making your plane into a waterlogged monokote bag of balsa splinters.