Haven't taken much of a look at the factions, but I always get a huge nerd boner from playing sarissa phalanx based factions. I just love seeing those enormous sexy spear walls moving around. They are also just so incredibly useful in a battle. Having a few phalanx units provides you with a very stable line around which you move your other troops, keeps battles nice and neat. I always like shitting on Roman armies with my old style Greek warfare instead of the historical other way around. I never like to play Rome in any of the Rome Total War mods I played, they seems so boring.
Okay, just checked the factions list. Where the fuck are the Seleucids, how can you have a Rome based game without including the Seleucids? Gonna have to buy 3 Greek factions as well, unless I preorder? Factions as DLC is just fucking moneywhoring, especially if the starting faction selection is such a joke, I am not going to pay them a dime for the other factions.
Any of the 4 Greek faction will be my pick I guess, probably Macedon first because they probably have the best cavalry to support the phalanx.