Read up on your history, buddy. Chariots didn't appear until the Early Dynastic Period in Mesopotamia (3rd millenium BCE), and full fledged cavalry didn't appear until the Iron Age.
What I would like to see would be an ancient Mesopotamia Total War. Perhaps starting with the fall of the Ur III empire (where you see a return to individual city states), ending before the late Bronze Age collapse; say, 2000-1200 BCE. Around the 17th century, things get very very interesting when the Hittites, Kassites, Egyptians, Assyrians and the kingdom of Mitanni form large states and compete with each other. Technology was constantly upgrading, in terms of new chariot technology, composite bows, scale bronze armour, etc. I think that would be a
ing sweet game. You could even have Mycenaean Greece in there, as well as the Trojans - and so, the map would stretch from Greece to India. Since it would be starting in 2000 BCE, you'd begin with only a single city state, fighting only with your neighbours, and eventually work your way up to a full fledged kingdom or empire after the initial 300-400 years. You'd have multiple invasions, such as that of the Indo-Aryans into Northern Mesopotamia and India, and the Arameans later on. Tribal affiliations (i.e. having an Amorite king from one tribe or another) would be very important in the political scheme of things. This time period would be absolutely ideal for a Total War game.