Rikki,
Your post echoes my experience with the PA4X. It really is a very good keyboard and the functions built into it are rather amazing.  The only reason I am selling it has to do with the styles Korg has put on this keyboard.  I auditioned every single one of them and very few fit the genre of music I am playing for my audiences.  I also have owned and gigged with the PA1X, PA2X Pro, PA900, and even the Microarranger.  All those had onboard styles that supported the older songs I play.
Anyway,  that is why I am selling.  Rikki, I checked the cost of shipping the PA4X to Australia and Wow was it a shock - nearly a 1000 US dollars with the insurance.  
Deane 
Hi Deane,
as to what Bachus mentioned,
I have a heap of factory styles from the older korgs.  All sorted into genres and duplicates removed. Haven't tweaked them, but a lot of them sound quite reasonable. I only tweak those as required if there's a use for it. If there's any missing from the pa3x that you were using, I could save you a copy. Not having a pa4x , I wouldn't know what styles they've dropped.
Also have some user and song styles I converted from my PSR  and Band in a Box, they have been tweaked . They're mainly ballads and a bit of swing. I really only  play older style music, matches my age. Haha. . Happy to send them to you to ftry while you're waiting to sell your pa4x.
I've sent a copy to a couple of other members, and unless they were just being polite, I think they found some of them useful.
That's why I mentioned pity we don't live closer. Haha , wouldn't only be shipping  costs, our dollar has devalued to 73 cents against your dollar and our voltage is different to yours
Anyway, if you'd like a copy, just email me..