Futuristic, post apocalyptic, mystery, psychological (?) - shows with a general "dark" theme
Well, surprisingly, there aren't many anime TV shows that mix those kinds of themes in that kind of arrangement.
In terms of psychological e.g. psychological thrillers you basically have a the movie
Perfect Blue but that doesn't fit with anything else you mentioned.
If you're looking for something on the more extreme corner of that genre you'll probably want to watch
Serial Experiments Lain.
In terms of mystery-focused shows that are also thrillers (something
Ergro Proxy really isn't, despite initial impressions) you should probably watch
Monster. It is 74 episodes long though.
In terms of futuristic, dark stories most of them are just kind of shitty action anime that aren't worth your time. You might enjoy
Casshern Sins, actually, which is a very well crafted and utterly beautiful series. It's relentless depressing tone does eventually become too much to bear for many viewers.
Texhnoloyze would probably meet most of your needs. It's also a fairly depressing series!