Edit: Also, since I'm being the 560 Ti card mentioned several times: The 560 Ti does offer better performance than the 560, but I think it's at least 60€ outside your budget ...
I thought as much as well. The prices here are probably a bit higher than those in Germany, and the cheapest GTX 560 Ti in my local computer store costs 199€ (the second-cheapest being 225€).
The same store offers several GTX 550 Ti models for less than 150€ (Asus, Palit and Gigabyte are the cheapest at 129€), many of them factory-overclocked, so you get more power without voiding the warranty; these can be identified by the OC suffix. All GTX 560's are more than 150€.