Ooooh - be prepared for a lot of differing views, my friend. We discuss this topic very often here and you will find EVERY opinion you could hope for. My choice for piano tone alone is the Yamaha 9000pro (not the psr model)
Second choice is tied with Roland VA5/7/76
and the Ketron SD1.
My weak choices are the Technics kn series and the Gem WK series. This is a personal observation, so spend some time with the units you like ...... ALL pianos sound different, even in the acoustic world.

I'd be surprised if you didn't like the 9kpro. Good luck.