It's the power that matters (Volts X Amps: if the stepdown isn't powerful enough, the device will draw more amps than than it can cope with and it will fry immediately). My spare stepdown is fine for PS1 and DC, but no good for Wii.
However, forget the stepdown - if it's for things with external PSUs (GC and Wii), just get a spare UK PSU and use that instead. Far safer. You can get new ones from Nintendo UK by phoning them.
It'll cost you, but it's the only sane option. You might find 3rd party ones on ebay for cheaps, but.... official all the way. For the Cube one, you could probably pick up a cube with PSU 2nd hand for the same price as a new one from Ninty.
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