Endlessly on Elektronauts:
@shinobi
There are trade-offs that you need to make arising from your various preferences:
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You want “unison poly”, which means that you need a fairly high voice count and probably multiple layers/timbres, which calls for a digital synth;
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You want low- or no-aliasing, which calls for either analogue or super-high-quality digital, which are expensive; as far as I know, the Nord Lead 2 and 2X are pretty good compared to the others you mentioned for aliasing, which may explain your relative preference for that;
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You have a certain budget, somewhere below 3,500 USD.
The first preference may be the easiest to address or rule out; I’m not a polysynth expert so I don’t know of any synths that have this “unison poly” feature, apart from stacking multiple sounds. If you know of any synths (even vintage ones that are out of scope for what you want now) that do this as you describe (without stacking multiple timbres), then letting us know would guide us towards helping you.
Otherwise, you need to consider something like a Novation Summit or Sequential Rev2, which can stack two sounds and still be polyphonic. Or consider stacking more than one synth to get the sounds you want.
Edit to add: consider Waldorf Kyra, Korg Prologue 16.