PA1x is only 62 note polyphony. PA600 is a much better deal.
You are probably right...also the PA-600 has DNC2, which should give it an edge sound-wise. Nevertheless, the PA1X is still a great sounding keyboard. I think it sounds better the the MicroArranger, and PA-50D.
On the PA-600, are you are able to use DNC2 sounds in the styles, as in when you revoice them?
Ian