Does it need to be a polysynth? There aren't that many great modern polyphonic synths- pretty much the only options are dave smith instruments tetra, mopho x4, prophet 08, and polyevolver for analog.
then the new elektron analog four now- though not sure if it is polyphonic or just 4 part multitrimbral (elektron site is down). I would probably only use the multitimbral aspect.
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