I have the same swap my self.
PA800 to Tyros2 back to PA800.
I find out that I can't live with-out the SONGBOOK-PADS- features of Korg arrangers. Is great too that I can load sounds, that you can get FREE, to the KBD with out the difficulties that the the Tyros 2 have. With 1 Gig of memory it took around one hour to load a piano sample from IRISHACTS.com.
So happy with Korg that now, I even have a PA588 too.
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Machetero