the interface is pretty much the same for all the models. if you play live in clubs or something, i would get something more powerful like the 60. But if you're just sitting around your house playing, then i'd get the 30 or 50, cause the 30 i have is real loud, and i keep it on 15w (there is a knob that you can control the amount of watts on the 30 and 50 models)