I demoed the PA50 and was not impressed. Although many people don't like the acoustic piano on the PA50, I thought it was quite good. The organs are very good as well. If I had to choose between the PA50 and PSR1500, I would buy the PSR1500, no hesitation. The sweet voices are just awesome on the Yamaha's, IMO. Neither Korg or Roland come close in the mid-price category.
Starkeeper