This time I do not fully agree with George,
I think the PA-80 will suit your wishes to a
T. In particular the sounds you mentioned are amply there and in very good quality.
The arranger section is among the very best, if not the best in the present line of top arranger keyboards. I just bought one, and seem to even favour it over the much acclaimed Solton SD-1.
And as in "three in a row" seeing it is always mentioned here in the same breath, the yamaha Pro9000 falls short of these in my humble view. And as you pointed out so rightly, the Korg is substantially cheaper than the other two topkeyboards. Furthermore they are very up-to-date with their operating system, I have meanwhile loaded their most recent, and second update, since it hit the market earlier this year.
GO FOR IT !!!!

john.