the PSRS900 is made in Indonesia. This is actually a good thing. Yamaha owns their own facility in Indonesia. If they were made in China, it would be in a factory making these for Yamaha.
When you say there is no difference in the strings, I think the "live Allegro Strings" is not called a "live" sound in the PSR3000, but I'm not sure because I don't have any 3000's left in my store. On the PSRS700, which I believe has the same sounds as the 3000, it does not have the "live" word printed next to the Allegro string name.

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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com