It should be 700-750W, modular, (preferably flat cabling) 80+ bronze or silver and a decent brand like Corsair or Thermaltake.
Are you running one which fits the above criteria and you're happy with it?
I'm not an older Australian nor have i hitched anywhere but there have been a few times when i've picked up hitch-hikers in the past. I have their bones buried in the back yard.
Just kidding. All the hitchers i've ever picked up have been lovely, decent people.