Ready to graduate from DJ Hero? Got a house payment handy? Then Pioneer would like to show you the way to the pros. Say hello to the DJM-2000, a four-channel digital mixer built around a 5.8-inch multitouch screen and sporting enough knobs, buttons and sliders for a NASA launch sequence. Designed to play nice with the matching CDJ-2000 players Pioneer released last year, the unit features an integrated audio effects suite with six dedicated processors and several intriguing modes for multitouch music control. While the mixer has the traditional cro