Your electric jetpack is cool, but it can only go up to y=80, not even a third of the maximum map height. The 'normal' jetpack is also cool, but refueling it is a hassle and it's very imprecise -- you can travel up at a ludicrous speed or fall at a slow speed, nothing in between.
Hence I suggest: The Iridium Jetpack! It combines the great features of the original jetpacks into one very, very expensive and very, very power hungry item.
Potential crafting recipe:
Where is a glowstone block