I figured it was either KSP or Ivory. In any case let us know what your specs are so that we can help you pick one: CPU, GPU, Ram, Hard Disk, optical drive, etc...
Here is the English link to KSP if anyone else needs it in order to help: http://ksp.co.il/main.php?now_snif=ksptelaviv > Click "parts" on the top bar > the "power Supply" on the side bar. It is arranged by company. Additionally they have Corsair which is also good.
The Seasonic M12II 620W (modular) is the one I have it is really good. It should be enough for a crossfire set up.
Although it appears that it should be fine... I would look into before getting it, just to be 100% certain, is if it can handle your overclocking your CPU + one maybe two GPUs. I guess that depends on how much you are overclocking.