A desktop 980 in any laptop form factor is going to be limited by cooling, not least if it's stuck in there with a desktop CPU. The thermal paste they use is the least of the problems with a unit like that.
Should able to pick up a CM Storm Quickfire Rapid for that kinda price or below. The Corsair K65 is around the same price point and looks flashier, the RGB version is still ~140EUR though. If you'd rather have a numpad instead of the arrow keys + home group there's the CM Storm Quickfire TK as well, roughly the same price as the Rapid.
A rig in that price range with a CX PSU is acceptable in Europe imo, especially since $800 gets you significantly less here. Those XFX PSU deal aren't a thing sadly. That said, you can find a much better BeQuiet, Antec, Silverstone or Coolermaster PSU in the same price range.