It's a bit of a modern myth that you need stirrups to mount an effective charge, a saddle with a high back was the real requirement. Stirrups improved stability some what, but their real strength was that they allowed to user to stand up in the saddle, which is very useful in melee or for throwing javelins.
Regarding the OP: Thracian Peltasts and Bosporan Archers are usually pretty high on my "to get" list.
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