With respect, I wouldn't touch that PSU with the proverbial "ten foot barge-pole". Assuming that GPU is going with an i3, or locked i5, 500w would be adequate, but please, a decent quality one. XFX, Seasonic, Corsair, BeQuiet, Antec all good makes.
Yeah I agree - if it isn't certified and rated - don't buy it! That PSU looks pretty but it will most likely blow up or short out on you.
I'd get something like this: http://www.scan.co.uk/products/650w-corsair-enthusiast-series-650txv2uk-85-eff-80-plus-bronze-sli-crossfire-eps-12v-quiet-fan-atx-v
The PSU is one area where you definitely don't want to skimp or cut corners or you could lose your whole build.