How far would you go to modify yourself using the latest medical technology?

In a New York Times article Saturday, author and broadcaster David Ewing Duncan offers a partial checklist of cutting-edge medical-technology therapies now under way or in an experimental phase that might lead to future enhancements, including:

Present:

• supermemory or attention pill
• cochlear implant to improve hearing
• brain-boosting neuro-feedback and video games

Future:

• retinal implant
• exoskeleton
• exoskeleton operated from the brain via fiber optic lines embedded under the skin
• drugs that alter enzymes and other proteins associated with genes for, say, speed and endurance or dopamine levels
• re-engineering cells and DNA to eliminate diseases
• grow improved fresh brain, heart or liver cells

Who would get the enhancements, how much twould they cost, and who would gain an advantage over others by using them?