Biggles,
camp out in your friends music room and sample their pianos!
AFA Yamaha is concerned, I had a Moxf6 - I thought a 61 key jobby would be plenty enough for me but although I loved the sounds, I kept falling off the end, and the "screen" and operating system layout was just, well, I never got to grips with it. I could have, but then I would never have had time to play the keyboard at all.
Pete Shaw has some great ideas for piano sounds that are on the Korgworld arranger webinars. He has a lovely "fragile piano" constructed of concert grand, sistro and DW8000EP layers (no split).
He also suggests knocking the top end off the concert grand (with EQ) and increasing the resonance to provide an Adele dark piano sound.
Lastly, he suggests this kind of piano sound is good for Carpenters music! -Concert Gtr DNC, Future Pad and Sistro layered on the top (he's very fond of Sistros), with G.Piano Stack1 on the bottom of the split. I don't think I would ever have come up with something like that!
But there are always going to be some lovely pianos out there. There's a fabulous one called Hoarfrost that I think is a Korg sound, but I can't just find at the moment. It's probably got some sistro in it.