I"ve just listened to those demos again. Is the piano sound really representative of what it sounds like live? Or can it be tweaked to sound as good as, say a PSR2000 or even a $300 YPG235 as far as that goes? The demos I hear makes the piano sound kind of tinky to me. Some of the guitars I've heard on line sound kind of lacking quality also. This is not meant as a cut but rather an observation.
http://www.yamaha.com/yamahavgn/CDA/List/MediaList/0,,CNTID%25253D5014662%252526CTID%25253D205200,00.html

I never spent much time on the G70, but the online stuff makes the piano sound pretty good. I am assuming the piano on the E50/60 is noticibly different?