Don't buy from PCWorld. They don't have any good stuff and everything is overpriced. May I suggest using www.amazon.co.uk instead?
For 200 euros, you're looking at GTX 660. I'd aim for this one, it comes at 215 euros and is MUCH faster than either of the cards your listed:http://www.amazon.co.uk/MSI-NVIDIA-GTX660-PCI-E-Graphics/dp/B0099AOAP8/ref=sr_1_8?ie=UTF8&qid=1356006604&sr=8-8