For good cyberpunk-transhuman reference points, check out Richard K. Morgan's books "Altered Carbon", "Broken Angels" and "Woken Furies"; a treasure trove of cybertech human enhancement. In his books, each humans' consciousness is "back up" in a tiny device called a cortical stack, effectively making people immortal. It's a cool concept with tons of ramifications. There's also cool weapons, interesting combat (and sex, let me tell you,) and nanotech that'll scare the bejesus out of you:)