I agree on Sides of Steel and Sail and Steam (haven't played the third), though they represent different eras of the Victorian age. A & A Games publish a number of rule sets for both the ironclads and pre-dreadnought eras (and I suppose there's sort of one in-between too, the 1870s-1880s stuff). Naval Thunder by Steel Dreadnought Games also has a pre-dread set of rules.
Chris