I would agree that the Hobbyzone Supercub is a great flyer on floats. Even if you don't upgrade to a brushless motor. One buddy flew his just as it came from the box, as shown in the video below. Another upgraded his with ailerons and better motor. Regardless, highly recommended.
If you a Spektrum transmitter, I recommend you get the BNF version. The first video is of the RTF with its own transmitter. Second on the BNF. Only difference is type of transmitter. Second video also has some other planes - I think the Supercub is the second one.
Hobbyzone floats are excellent and we use them not just on the Supercub.