Hello Tonkan,

If you want to practice your piano playing technique I suggest you go with
P80. It's keyboard action is closest to real pianos.
YAMAHA is the best in making weighted action since they have a lot of experience in making real pianos. Even some other brands like KORG, use YAMAHA's keys in their products.
I have played KORG SP100 an Roland RD-150 and they have much softer touch then
P80. They are good abut the action is far from real grand piano.
Also, I have read many reviews about electric pianos and in that price range P80 is the winner.
Therefore if you want to develop piano playing technique I suggest you go with YAMAHA.

Regards,

Denis