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Apart from the Crimean War, well covered by Strelets, and of course the Napoleonic wars, I'd like to game:
The Italian Wars of Independece are immensely interesting, not at least because of the very colourful uniforms, Zouaves and all that. Not much available in plastic - apart from the French. I know of two really awful sets of Austrians, and some slightly oversacale Italians.
The Second Schleswig War 1864 is also interesting: skirmishes, assaults on fortified positions including landing on the island of Als, modern artillery. You can use the 1870/71 Prussians, and ACW Union troops (probably also 1877 Russians as produced by Strelets) as Danish. Again better Austrians are needed.
The Franco-German War of 1870/71 gets some coverage but you will have to look at metals for artillery, and do some carving for German cavalry (Strelets Crimean War British heavy dragoons e. g.). Regards, Pa