From a "Value" proposition, I would say that the Korg Pa2xpro is a leap forward in arranger technology. Across the board, look at the features and compare to every other keyboard. The Korg comes standards with

Color motorized touch sensitive screen.
TC Helicon Voice Processor
DNC / RX Voices
Korg M3 Synth engine and probably the best synth out of the whole group.
Included Hard Disk
the Best Songbook function
Usable Multi-Function Sliders
USB Thumbdrive jack just where it SHOULD BE!!
Balanced Inputs
Guitar Mode
4 Effects Processors with a choice of 125 effects
Double MP3 Player / Recorder
Most Configurable Operating System

All of the above at the LOWEST price point of all the keyboards mentioned!