1) Time travel
2) Relocation to new and distant planets
3) Cybermen
Apparently the possibility of being able to read a person's mind is well on the way to development now. Once perfected, it'd be easy to implant something which'd allow people to do that without being wired up to various gadgets.
A bit of a dangerous idea if you ask me though!
I want
1 - a pan galactic gargle blaster
2 - Instant no distance bound space travel
3 - the sort of broad mind that comes with knowing you are not living on the only inhabited planet that exists