There was a topic like this on RPG.net a few weeks back. I think that Feng Shui would work -oddly enough. But something like Exalted would work too - if you wanted a truly heroic game. I suppose Seventh Sea would probably work too though its a lot lower magic than HeroWars. You could probably use Lace and Steel too, on some thought.
All of these are very fluid games.
Jeff
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