Good Dystopian/Post Apocalyptic Anime?

I've seen the likes of Ergo Proxy, Code Geass, Ghost in the Shell, Texhnolyze, Wolf's Rain, etc. But lately I've been in the mode for another good dystopian type anime and it seems like every time I search for one I come back with only animes I've seen before. I would also be up to a good read also if there's a good manga.

Some of the things I'm looking for are (but are not only bound to)
- futuristic type world/robots/mecha
- good animation
- a good plot with twists and a lot of depth
- possible tragedy
- something that will just get my attention


Please? And thank you ♥