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Turkish artillery would be useful especially for Kars and Bashi Bazouks could be used for lots of other conflicts in that part of the world.
Yes you are right. Other than field artillery and Italeri/Esci and Emhar do that, the Russians are quite complete. It is a magnificent series.
Emhar do the French infantry but when I look at them I think they are more 1871 than 1854 but with Enrico Ricciardi type modifications (beards and volumising) they look good.
So:
almost complete
greatcoats infantry and artillery
artillery
everything
Sardinia everything
Then for maybe the first time in the history of plastic 1/72 scale figures there will be some semblance of a range similar to the ones you get in white metal (eg -Wargames Foundry).