One last observation: A lot of arranger players are not techie types and don't really have an interest in fooling around with any keyboard they buy - they just want to sit down - pick a style- and play. That is really the group I belong to

I entirely concur with what Deane says here. As such Korg is not the first and best choice that comes to mind. Tecnhics was one of the first to introduce the Songbook feature and Korg was the last to implement it.
And even their factory entries are very "superficial " in that they have simply combined a factory preset style with one or two righthand factory preset sounds, without any substantial tweaking.

I agree with Deane that the Micro is very good value for money but one does need to get into some tweaking at the very least. And yes there should be demos or a DVD from Korg to give support in this area as well as an editing program. I would not hold my breath though..........

regards,
John