I would love an authentic piano.
Since I do not have that, any keyboard that has been able to effect a more real sound or whatever sound I am looking for has been a Casio.
I have 3 of their synths.
I have 2 Yamaha's, great for what I am looking for.
But as far as an extended note and richness in quality with acoustic sounds, Casio has been the best.
Although I have never had any keys with a market price over $200.

Horn sounds seem to be the biggest obstacle with all brands of synths.
But I know that is another topic.