I've already bought some components for my new build, like an MSI Z87 G45 Gaming motherboard, an MSI R9 290 and 16 gigs of Corsair Vengeance ram. I'm going to buy an i5-4670k and will overclock in the future but I probably won't overclock my graphics card. I'm not sure what PSU I should get, I was thinking about getting the Seasonic S12II 620w (57 euros) but I'm not sure if it'll be sufficient. That's why I also thought about buying the XFX pro750w but it is a bit pricier (84 euros). Would the seasonic S12II 620w be sufficient or should I buy the XFX pro750w? My case is the HAF 922.