[Endoperez]

Ulm: slow units, heavy infantry and cavalry, arbalests as only missile troops, only one mage, construction/evocation based research with some buff/debuff possibilities

Pangaea has Centaurs (good cavalry), Satyr infantry (light, fast, stealthy), satyr hoplites (decent, slower); you can choose between Panii and the Dryads, and Nature gives some interesting choices. If you take a Death pretender, or Late Age Pan, you'd also get the national undead summons and mandragora reanimation.

Caelum, as mentioned. Mammoths, flying archers, the well-armored fliers are hard to use well, very good, mobile mages.

Perhaps MA Tien Chi, if you play with the newest patch. They got a bunch of mapmove 2 infantry, they already had good archers, and they have LOTS of different mages. Acid evocations and lots of other fun stuff.