Gary,
Your evaluation of the PSR2100 would be great. Still, I'll wait for an Eko open system type keyboard. I was thinking this morning, while eating breakfast (I know I should get a life) that one of the big three (Yamaha, Roland, Korg) will soon come out with a closed system. Proprietary operating system with replaceable styles and sound fonts, which could be purchased, for a fee, at the manufactures web site and loaded onto a stand alone keyboard. That would make me interested in upgrading to a software arranger.
Just a morning thought.
Starkeeper