I'm thinking next generation to the Evolver series, or a Rev3 of Prophet series would make the most sense.
Evolver with 16 voices, improved digital engine, improved UI, improved combo/stack and modulation matrix upgrades.
Or
Prophet Rev3 with advances to more closely match capabilities of the Moog One... Improved UI, dual filter series/parallel routing, expanded effects engine, expanded mod matrix functionality, and voice modeling capabilities.