the Audya as good as as it sounds is simply a play back arranger so for me no matter what the price i couldnt buy it because after a year i would be bored with styles and guitar licks if i couldnt edit them . I know there are many users that dont get under the hood of their arranger but for $5000 you could by a pa2X and a tyros 2 and have a ball just using the preset sounds and styles.
The audya demos are nice but listen to this Tyros 3 demo
http://www.youtube.com/watch?v=bkEQfEzNw9E and tell me if it doesnt inspire you