There're nice dance styles in PSR-S950 (including audio-styles), as for voices, it has the same set of synth-voices as PSR-S910/PSR-S750 does which is quite good, too. But I believe that for this sort of music it's essential to have an arpeggiator and knob-controllers. The Yamaha MM6 has such things, but on the other hand it's quite limited in other aspects - poor navigation, poor polyphony and I don't like its voices much.

I guess that this sort of music is mainly produced not as life-time performance but as part-by-part type of working, using PC or MAC, Motif and other stuff - but this's just a guess.