If you buy a PSU that has greater than 80% efficiency, it's fine... won't run hot or waste electric. The computer is only going to use what it needs, so the extra wattage won't hurt anything. You should always get 50-150w more than you need anyways... just so you never stress the PSU itself. 200w extra will leave you some breathing room for future video card or CPU upgrades also.
Just look at the specs and make sure it has more than 80% efficiency, and everything should be ok.