Or how about the idea of enhancing the bodies we currently have?
Let's take muscles as an example, because they are the most obvious. You work out and this tears the muscle. The body simultaneously tries to close the wounds and grows new tissue to fill the gap. Additionally, there is a biological limit to how much muscle your body can grow without some sort of stimulant. Now, enter steroids. These allow the body to grow new muscle tissue faster, allowing for faster growth. They also allow more muscle to grow, where the body would normally be physically incapable of growing it otherwise.
This is just steroids for muscle growth. Why not try steroids for bone strength? Chemicals to make the bones harder, the marrow denser. The brain continues to develop, even as an adult. As the brain is "exercised" it develops more folds and more neurological pathways. Who's to say we can't speed up that growth as well?
I'm not saying that we should necessarily use the steroids of today, but such chemicals would avoid many of the nasty ethical dilemmas associated with cybernetics and genetic engineering. It's there, but nobody is going after it. The precedent is set; we know it can be done.