Korg PA 800
- Sounds - overall it has additional sounds in all categories (mostly RX sounds and alot more Synth Voices)
The main areas that shine over the PA500 are strings / voilins / EPianos / Organ and Synth Lead.
- After touch
- better key feel
- additional Assignable Slider and u can have up to 2 functions each on each slider - all customizable
- 2 Assignable switch buttons as opposed to 1 on the PA 500
- more sound and style locations
- USB storage (SD on PA 500)
- TC Helicon Harmonizer (I don't sing.. but its there)
- the DACs are much better on PA 800 (when u use the PA 500 through a mixer and external monitors - you need to put the volume alot higher for some reason. it also effects the overall quality and richness of the total sound (some might not notice it - but the overall ambiance was just a bit better when i went from PA 500 to PA 800.

In Australia - Second hand PA 500s are around $1200.00 whereas PA 800s are $1800-$2000. so its definitely cheap for PA 800s here. there are even a few PA 2Xs now under $2500.00

-Nick