As a coding challenge I guess 1MB OCS is the most appealling, but to give the devs a little more headroom to chase/realize a more advanced idea I'd say, accelerated A1200 with 030 (or fast 020) and 4MB Fastmem.
My first expansion for the 1200 back in 1994 was a 28MHz 020 with 4MB fastMem and it felt like a new computer compared to stock A1200. And it was quite affordable back then already.
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