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Armenia: Essentially the same as Pontus but with horse archers. HA's are best dealt with via bribes or Greek Cavalry in a pinch.
Parthia: Horse Archers are a pain, same deal as Armenian HA's though, bribe them. The big difference here is Parthia also gets great heavy cavalry fairly early on, which decimates your greek cavalry. Elephants help but not much. The best thing that can be said about Parthia is they're bad at sieges and only have two provinces near you.
Bride does work, but is it better to spend the money on your own troops than theirs. I find the best way to deal with Eastern Factions is to fight them in sieges. And it works! City fights makes the HA obsolete, and pretty much does the same to other cavalries since there is no space for them to fight to their best plus with phalanx troops even a couple of militia hoplites could deal devastating blows to even the mightiest of Parthian or Armenian armies.