Sorry to ruin the party but ...
altough Tyros and/or Genesys are indded an improvement, they are NOT realworld sounding at all. Synth(etic) feeling all over.

My personal fata morgana of Gigastudio-type quality sounds combined with sophisticated auto-acompaniment styles still remains;

I fear there is no alternative than to use harddisk streaming and NOT limited chip-based sounds.

listen to "A little Chopin" at http://artists.mp3s.com/artists/42/john_lewis_grant.html

This is a streaming sampled piano.
Imagine a Tyros build with this level of quality...

Aahh imagine....