At any rate this will all be Water behind the bridge soon as the new models come out very soon....
Dream on Donny !
Sure there will be a PA5X no doubt and possibly even late this year, at least a possible introduction. But before effectively hitting the stores we will be almost a year on. As to a follow up for the PA1000, note approx. 2 to 3 years......
But both you and Don have summed it up quite nicely, the difference with the PA4X is "balls " and 1800 bucks.
Still as mentioned before with substantial tweaking, adding some external samples ( free or paid for) and possibly the addition of the Musikant stick ( which I did and to the best of my knowledge so did Scott Yee) the PA1000 goes a long way to making one happy. AFter all it does have the added advantage , even over the PA4X of internal speakers and quite a good amplifciation , only slighty inferior to the much acclaimed amplification on the best PA ever, the PA800......
regards
John