The Seleucid Empire (of those I've played so far, i.e. the Roman ones and the Seleucid Empire).
Large variety of units, money pours in like there's no tomorrow once you conquer Egypt, good variety in your early enemies (Egypt are tough to beat, as are the other Greeks). And I usually play rather slowly, yet I finished the long campaign by 237BC. So yeah, they're excellent.
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