Hi, I'm a beginner in keyboards and I'm looking for cheap options that I can take advantage of, even if it's not professionally. Recently I have been looking at casio keyboards both the ct-x3000 and ct-s500 models that share similar features and fit my needs, however I find that they have some different features, for example: the casio ct-s500 has some knobs assignable for certain functions and the ct-x3000 does not have them but instead has rhythm creation (styles) and more slots available to save configurations. Both keyboards have similar prices but I would like to know which one is more useful and versatile for me, I play in a rock and ska band and I need to improve my gear.