It is seldom worth upgrading to the next generation of instrument (Unless there is a problem with what you have) as the differences are usually not that great. (Certainly not worth the money you lose trading up)
Best to go for a 2nd generation keyboard (PA800 to whatever replaces the PA900) as the differences are than usually quite marked and well worth the trade in price.
Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).