will be fine for you. The same model can be found in the UK if you're not a US dweller.
If you were getting the GTS 250 green simply due to power saving features its really a bit of a moot point because a bad PSU will strain under a green or non-green 250 alike.
Its probably not what you want to hear, but go for the PSU option if it has to be one or the other. After that, save your money some more and get an upgraded card. At least with a better and well known PSU you can rest assured that an upgrade will be powered just fine.