Frank,
FWIW, I think Korg have got it about right for a pro arranger in the PA2x/PA800 maybe just add the ability to read word files instead of just text, might make a bit of difference to the lyrics function, or even the ability to add bmp's as the Rolands do. But overall its the best one out there, and I have played them all to some degree, except the s900, but the yammies' are all so, bland and lifeless I didn't bother.

Another suggestion is that Korg add some arranger functionality to the M3, now THAT would make for a killer board, which would truly be "cross-platform".
Dennis