I'm a Korg fan boy, so take this with a grain of salt. I previously had the DW-8000, which I absolutely adored. Unfortunately, I had to sell it to make room in my rapidly dwindling studio space, a decision I've regretted for some time.
With 8 voice polyphony, each with 2 digital sampled waveforms, a VCF and amp, plus separate envelopes for filter and amp, you've got a recipe for quite the impressive synth.
Still can be found for a very nice price. Just keep looking!