Why did you get rid of the Mo8?
To be honest I really don't like the piano sounds on it...at ALL.
It's heavy, and it's too big for me to travel with.
I like the EP's on it and using those sliders in Performance mode...but overall i wasn't happy with it.
I went to Guitar Center last night and spent some time on the XS. MUCH improved. The piano voices are more editable.
I also spent time on the S90es, Roland 300gx and the Nord Electro 2. The Electro 2 really has me thinking.