Sorry in advance for slight threadomancy!
I haven't actually played any historicals yet, but have collected and am working on a number of armies/projects at the moment, none of them Napoleonics though.
It seems like with Napoleonics you're spoiled for choice with minis and rules. The stuff I'm working on right now falls mostly under the "ancients" umbrella - early Imperial Romans, British Celts, and Greek Hoplites. I haven't settled on a ruleset yet, I guess that will depend on what opponents are playing (if I can find any...).
I've also got a handful of 28mm WWII figs which I plan on using with Operation: Squad. I have the rules and they look like a lot of fun - pretty fast-paced squad-level game with solid but not over-complicated rules.
If you're interested, I know there's a Yahoo group dedicated solely to variants of the LotR SBG game system, and it includes several historical variants.