That's a pretty wide price range. I don't know how much the Dell U2713HM costs in Europe these days, but you can get it for $600-650 in the US. That would be my recommendation for a full-featured 2560x1440 monitor backed by a great warranty/customer service. Your alternatives are the cheapo Korean monitors found all over eBay (e.g. Crossover).
-What is best in life? -To crush your enemies, see them driven before you, and to hear the lamentation of the women.
There is also the Asus PB278Q monitor which is a bit cheaper than the Dell monitor. There are the ones from eBay which are shipped from Korea so you are taking a risk there in getting a bad monitor. Some sellers will work with you though so you don't have to pay shipping back. I ordered mine from monoprice, but I am not sure if they ship outside the US.