The narrator is wrong in saying the Donner DPP-80 has reverb and chorus effects. It does not. No bells and whistles of various effects, just the piano sound with triple peddle.
I would buy the Yamaha NP-32 which is being offered for around 300 USD. Its sound is way, way superior to Korg's B2, though the B2 has better keyboard quality.
I have a Yamaha CVP-809 that I really like. The fulcrum is far forward which makes playing high up on the keys easier with large hands. I felt a large difference from the P125 Yamaha that I started on. The NX3 will be the next one if my son or daughter show interest.