Casio wk3200 and 3300 keyboards

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Hi, does anyone know anything about the Casio wk3200 and 3300 keyboards? We want to get one for our daughter. She likes the sound of the ones with ZPI sound source technology. But searchs on the web show these models but don't mention ZPI. We are wondering if Casio have them with and without ZPI. Does anyone have any experience with these? And what's the difference between these two models? Any help would be great. Regard, Hari