I just looked at the manual of the s2000 and IMO this could be a nice tool to play with. Since its a "real" sampler (I learned sampling on rack samplers so MPCs always taste more like drummachines with sampling option to me)
its got much more flrxible options of sounddesign. LFOs, much more complex envelopes and routing. For example a pitch modulation that can be used with ENV2 so it might be possible to create nice electronic kickdrums (kind of 808/909).
Then there is the lower samplerate option (10k bandwidth) that might help to get more dirty sounds. And the possibility to sample really fast material (a pitched up sample) cause the s2000 can pitch down much more than the MPC2000 (only 24 semitones).
Another benefit of the s2000 to the MPC 2000 are mute groups which help playing good sequences of chops without the hassel of the MPC workflow (pad1 mute pad2 and pad 3, pad 2 mutes pad3 and pad 4" and so on).
To get more dirty I would sit down for an hour and try to find a good combination of samplebandwidth, pitched up sample and recgain.
I would start with a well known drumloop and sample it at different speeds (up to +48 semitones) at different bandwidth with different recgain adjustment.
If the results sounds to dull you can either use the filter with resonance to bring back the high frequencies (if there is anything left
) or boost the mid/high frequencies before sampling (and before speed up the original sample).
EDIT: Oh I totally forgot about the resampling function. So play around with this too (sample with high bandwidth and resample to lower bandwidth afterwards). Also try different quality settings there 1 is low quality)