The Archaon on horse is a beast. He's a bit expensive also, I think 320, but with a 3+ 5+ save, and the ability to bounce mortal wounds back, he's pretty survivable. Obviously his sword is terrifying. Also, just for fun, Crom the Conqueror is a great little Leader to throw in for 3 places of power. 3+ 5+ save and he's -1 to hit in combat for 80 points.