I agree with bradmz. The px5s is a really unique hybrid between synth and stage piano, but most users are going to find its prime use as a lightweight gigging piano with the extra sounds/tweakability as the proverbial "icing on the cake." Given time, you could probably make the px5s a prog rockers dream come true, but any of the keyboards you mentioned having an interest in, probably have sounds fairly close to what you are looking for without doing any serious editing.