A competent immune system that can't beat cancer, COPD, Diabetes, Athrose, and a billion other diseases you mean and in some cases even does more damage than heal. And lets not even mention your standard viral and bacterial infections, which will be entirely new level of crappy illness once immunities to our chemical counter measures fully develop.
This is what i want!
1) A fully regenerating body platform, with nanite based regeneration system that can update, contain, destroy and heal. Cells, down to the lowest level (cell cores and even beyond that, on the atomic level) as well as meta structures like skin, hair, organs. That can clean the blood stream and close wounds instantly. That can shield us 100% from heat and cold. That prevents smells. And could make us entirely immune from radiation
2) An updated stomach system that produces 0 waste, but converts any material into energy.
3) Stronger arms, legs, back and neck
4) Better eyes (and now to your reply)
- Yes, we can see right now, but you are well aware that we only see 1% of the world. For example, with better eyes we would gain the ability to see a VIRUS and how it spreads, to see how particles spread through the air. We could see the actual air particles moving around. We could also see in the dark and gain an entirely new ability (we'd be able to see heat emissions of any kind)
And abilities.. i want all abilities that exist and are possible. More importantly, i want eyes that are shielded to damaging light waves automatically, i want zoom, digital snapshots, overlays and augmentations. I want to see if an object is magnetic, and i want to see what material it is without touching it. I want to see electricity flowing and static electricity.
Your question is like asking a starved men what he wants to eat if he could choose everything. I only touched on like 1% of augmentations ;p