Yeah with Fall of the Samurai I was hoping that they would do something like that, doing years 1890-1930 or so.
But Grif's idea is good too. 1835-1935.
It'd be ideal if you think about it. There was a lot going on in that period, such as the Crimean War, the Great Game, Afghanistan Wars, Zulu Wars, Boer Wars, American Civil War, Opium Wars etc.
The Victorian era is just full of possibilities. Hopefully we'll see that after Rome 2, but Rome 2 will be fun to play.