Just testing the waters:
If I can get a used PA80 .... I'd part with the PSR3k, case, SD card and SMF library.
Maybe even a NEW PA50 ..... not sure about that yet..

I'm just spoiled by the key action of my new PA800, and I can't imagine EVER going back to a psr again. I don;t even want to play it at home.
Any ideas?