Ops. . Made some corrections. I didn't want to list all of the product line. I assume the PSR450 will replace the PSR350. The reason I did this exercise is because the PSR550 IMO and the opinion of many others (including Squeak) is that the PSR550 is situated between the PSR350 and PSR1100. I thought it was discontinued as well, but can't relocate that post. This model IMO is the 1st serious instrument, with excellent voices, a much higher wave ROM, and great value for the money. It would be a loss, for me , if it were discontinued without a replacement. The PSR1500 might be out of my affordability range (we'll see), but a PSR560 or PSR600 would not.
Starkeeper