Any high wing trainer will handle floats very nicely. The problem is, when you move on to something more 'scale', such as a Cub, Decathlon, Citabria, Husky, Beaver....etc, they are less forgiving and do NOT fly like trainers (the cub especially). That's not to say that any of these models wouldn't be a good second plane for you, but adding floats to your first plane, makes a good second plane....get my point? THEN, maybe move on to something less forgiving, and better looking for your water flying. One plane that is relatively inexpensive, has a classic look, but flies more forgiving than some of the above mentioned planes, would be a Sig Rascal. They make them in ARF form, and would be a good candidate for floats.

Chad