Actually it's not enough pikemen. A small phalanx was 16 companies of 256 men each. A real phalanx was 3 small phalanxes. The cavalry is just there to hit the enemy in the flank/rear while they are engagin your pikemen. That's the Macodnian way. And this is how I try and use my pike using greek armies.

Now
Rome, pre-marian 2 velties, 2 Roman archers, 4 hastati, 4 princepes, 4 triarii, 2 equites, plus general and siege weapon
Marian 1 first cohort, 9 legionary cohorts 2 archer auxilia, 2 auxilia spears, 2 Roman cavalry, 1 cavalry auxilia, 1 legionary cavalry, general and siege weapon
Civil defense forces 4 town watch 2-4 praetorian/urban cohorts, 2 gladiators and or Arcani

Rome however is a special case because I will switch out the siege wepaon for war hounds pigs or Arcani

Seleucids
2 silver shield pikes and legions, 6 phalanx pikemen, 2 archers, 1 militia cavalry, 2 greek cavalry, 1 companion/cataphract, 2 war elephant/armoured elephant, general seige wepaon.