If I didn't have to buy one immediately, I would wait for Korg to come out with a new PA1X with the newer engine and polyphony from the PA800.......... plus whatever else they can come up with in new features and sounds (the piano in the PA800 totally blows the PA1X out of the water, IMHO).

Maybe a used PA1X will suffice until the next generation PA1X comes out if you HAVE to get one now....?
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An arranger is just a tool. What matters is what you build with it..!