Ergo Proxy is extremely pretentious and nonsensical. I wish I could recommend it because it looks so cool and has a great opening theme, but the truth is that after the first 10 or so episodes, I just lost interest. Compared with Texhnolyze, it lacks vital human empathy to make the characters interesting enough to follow for the whole series.
With that said, it's places a lot of emphasis on high concept philosophy and symbolism - a lot like Ghost in the Shell 2: Innocence.