I like the way the Korg styles sound better. I like the Yamaha panel voices better. Just a personal preference.
I have a PA80, ( similar sounds to the PA50 ) and have played around quite a bit with the 3000. I also have had a couple of PSR2000's.
My first choice would be.. spend the extra dollars and go for the 3000, or second choice go with the PA50. The 1500 would be my last choice. It's really difficult to tell someone who cannot play and hear the instruments.
AJ
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AJ