Looking for a Nvidia card around 300€. Would it be worth getting a GTX760, or is it just a minimal upgrade? I saw a couple of them for about 250€. I haven't upgraded my PC in a while so I don't know what cards are good at the moment.
A 760 will be a huge upgrade from what you have, and will beable to handle max in most games athight-medium fps.
I also thought about GTX660 which is only 190 €, would it be worth considering as well?
If you want max in most games at medium-high frame rates, you're going to be paying max money with medium-high power consumption. The GTX 760 is the LEAST you're going to want.