What do you think of the Behringer DJX-900USB(€ 215) is it worth buying? I am considering of upgrading my setup from numark mixtrack pro to something from the club scene. I want to be able to use traktor and serato with the mixer because for now I won't be buying any CD players. I am a bit confused because I have read that you need to buy a soundcard for it to work without CD players. So what do you think should I buy it or not?