I have both the PSR3000 & KORG PA50. Taking into account the 3K is twice the price of PA50 it should be better.
PA50.You can mute any style part as per 3K.
There are 4 PADS which can be customised to do various things including muting style parts like press one pad to mute all parts just leaving Bass & Drums. You can set PA50 to have 80 OTS's to each style. The keybed is much nicer to play and it's speaker output is greater than the 3K.
PA50 does not have Mic input or Vocaliser.
I am fortunate to have and enjoy playing both.

[This message has been edited by Graham UK (edited 06-19-2006).]