Good thing about Empire Earth II is that although it's like 8 years old, it's all 3D rendered, the textures used for the land is high enough res to not look awful and scales well by using a higher resolution. The units are always polygons although not really textured, they look great still though because no fixed resolution bitmaps are used. There's also the addon, "Art of Supremacy".
Not sure but maybe the GOG version is the one that includes the addon.
I spent hooooooours on that game...
Might go back to it.
People say Empire Earth III wasn't as good, I only tried it for about an hour and have to agree, it was much more watered down.