Privia is the name of Casio's digital piano line. They have 4 layer stereo grand piano tone which provides dynamics that are seamlessly articulated using Casio's Linear Morphing sound technology and up to 256 notes of polyphony depending on model. All Privia's feature a Graded Hammer Keyboard action which simulates the action on an acoustic grand. The Privia series has also been known to have excellent quality piano sounds and effects comparable to its competitors like Yamaha, Roland, and Kawai.
PX-5S - A stage ready variation of the PX-350, the PX-5S adds tone editing and controller capabilities and a new Ivory Touch keybed. The internal speakers and accompaniment were removed to a facilitate the new features. The PX-5S weighs under 25 lbs.
PX-350 - The new PX-350 features an LCD display, new improved 4 layer stereo piano tones, a 16 track recorder and new accompaniment capabilities.
PX-150 - Entry level piano. Minimalistic look and design.