Hi Don,
Congratulations with your new Pa800. Please post a review or maybe even some recordings for DNJ

The Pa800 can use any style made for Pa80 and Pa1X and they will normally sound good without any need for fine tuning. Korg has a lot of styles available for download on
korgpa.com . Many of them are already included on the Pa800 but make sure that you check out the Technics styles. These have been professionally converted and fine tuned for use on Korg keyboards, but they still retain that typical Technics sound (which you might or might not like).
You can also find a lot of styles in Korg format
here . The styles are converted factory styles from various discontinued arrangers. As you know you should be prepared to do a lot of tweaking to get a sound quality similar to the built-in styles of Pa800.
When loading data from other Korg keyboards please remember to delete any global files beforehand. They have the extension .GBL. You can really mess up the Pa800 if you load a global file from the Pa1X - I speak from experience

Kind regards,
Tommy