Hey Squeak,

Korg:

http://www.korgpa.com/pa_root/en/products/pa1xpro_demo.html?en

Ketron:

http://www.ketron.it/demos/index.asp

GeneralMusic:

http://www.generalmusic.us/Genesys.Htm

Liontracs Mediastation:

http://www.lionstracs.com/index.php?module=Static_Docs&func=view&f=/demos.html

Now I know they're only demos and you can't tell much by demos and all that jazz....but I'd be curious to hear which manufacturer you think has the best sounding demos.

-mike