Light Combat Infantry: Velite Gladiators... very tough guys.
Missile: Cretian Archers, or Balearic/Rhodian slingers.
Pike: Armoured Hoplites, Better armoured than Spartans, take less time to train and almost as tough.
Heavy Inf: Urban Cohorts... be afraid be very afraid.
light Cavalry: Persian Cavalry, "Catch me if you can... And be shot at while trying!!"
Heavy Cavalry: Cataphracts... The finest Laxative denarii can buy.