"L'état, c'est moi."
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Caution: May contain wargame like substance
If you're looking for variety, I'd have to say Warriors of God. The combat resolution system is very, very similar in all of Columbia's games.
Seconded. I love CG's games, but all of their games follow a certain style, so if you love that style then CR is a no risk purchase, but if you're looking to try a different system, then go for WoG.