In order of what I'd actually buy:
1. A back to basics tool watch focused Railmaster with a plain matte black dial, solid caseback, fully brushed bracelet and a mostly or fully brushed case. 36 mm and 39 mm sizing.
2. The Constellation they just released, except done properly. Much thinner, a smaller diameter, a seconds hand, with the Constellation name on the dial instead of "Observatory", and cheaper. Also, offer a plain silver dial option that isn't tied to an extremely overpriced white gold case.
3. A faithful 165.024 heritage reissue, similar to the 1957 trilogy releases back in 2017.
4. A new, refined Seamaster generation. 40mm, thinner, subtle matte wave dial, preferably with a tapered Bond bracelet and no more maxi hands or indices.
I put the SMP last only because I don't think there is anything Omega could ever do to make me trade in my GoldenEye. A perfectly executed Railmaster could see me trading my 2504 in for a newer one though.
Also for the Seamaster, a Peter Blake inspired variant would be a bonus, but in my fantasy lineup there is a 165.024 reissue so I don't see a need for a new Peter Blake.