Out of the expansion civs, i picked Babylon, and it's Songhai overall. My beef is, because I am playing in stereoscopic mode on my asus monitor, many leader screens pop out, which is only a problem, when you are reading a text that does not pop out (this means always, as I usually rather read the text than adore the pictures). Babylon is a good "aquarium-style-screen" (aquarium style meaning no, or only few pop-outs) and Songhai is a fantastic one, making good use of space through little sparks. Polynesia is not bad also, but the back of the screen looks very "cardboardy" in 3D; like a cheap school theater production or a museum exhibit.