If TS is referring to the Seasonic on his profile, confirm plus chop it will not have a switch for voltage and will not need one either. All he needs is an adapter for the power cable and it will work fine in the US.
The only other thing he might need is a UPS if the area he is moving to is prone to brownouts.
If he is inclined to change parts, he can wait for Haswell to appear and buy it from Newegg or even a Microcenter when it appears...