Vilo,

If you can get a second hand PSR-S900...go for it!

I love mine...it's one of the best keyboards I've ever owned.

You can't go wrong with a PSR-3000 either.

Both have Mega voices, but the S900 has the edge by having the Super articulated voices as well.

Good luck.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.