Hi Artaher
I have to agree with Gunnar Jonny here in that what really matters is what is in the eyes & ears of the beholder. At the end of the day it comes down to a personal choice.
You are likely to be met with a lot of Technics preferences here which is quite right seeing that it is a Technics discussion page of Synthzone.
You will be hard pushed to find a better top of the range keyboard than the KN6000/6500 but please bear in mind that it is very likely that after Frankfurt we Technics owners may well be drooling over a new KN7000 with whatever new delights that may bring.
Although the KN 6000/6500 vocal harmoniser was never rated as being much good & personally I think the same. The PSR2000 does not come anywhere near to the all round quality of the KN6/65 & at half the price you would not expect it too so Gunnar Jonny is correct in saying that the KN1600 would be a comparable alternative to the PSR2000
Regards Johnnie