The S700 has mega voice styles, and also has the organ drawbars as in the S900.

Polyphony is less at 96(as opposed 128 on the S900), there are less styles(205) and the screen is not color.

If you want 128 poly, you could also look for a second hand PSR-3000, which also has worship styles, organ drawbars and the mega voices. It also has a color screen.

Hope this helps.

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