At one time Mexico would have been at the top of my list but since the country is almost in a civil war with the drug cartel I have struck it off my list until something positive happens there.
I don't think if the country has nuclear weapons should play a role in were I would want to relocate to because of the fact does it really matter. If these weapons are used it won't matter were you live the weapons will wipe out the communications anyway. That said one of the hottest hubs for tech is becoming Dallas Texas. This is a big city with many areas around dallas still very cheap to live in with excellent infrasturcture.