CBM is the only one I know of that changes the generic game. Thus you choose either vanilla or CBM. I like CBM better because I don't enjoy gemgen micro and I think it makes it more worthwhile using some summons. I don't like that it removed hammers but then also it sucks that Earth is the only way to get them.
All the nation mods on the previously mentioned page are good, try them yourself because there will be ones you gel to that others don't. Personally I enjoy the Warhammer mods (not all but most), Shangri-la and Alchera perhaps more than the others. But they are all quality, although some are still works in progress.
Why don't you try some and review them for us?