thanks for your answer
honestly, I was thinking of buying the gtx 960, because i REALLY want to play fallout 4 and occasionaly other games 
i’ve got a very good pc that i use for work, with an old ati radeon hd 3450. It’s ok for working with audio, but not for gaming, so I was geared toward a gtx 960, a vga with good performance at relatively low price (190 euros).
But I was discouraged by the problems that many users have encountered with waves and cubase 8, even if I want to do some game in a while, it’s still the PC that I use to work on audio. But if you tell me that you have not had any problems, I feel much safer to purchase it.
@Richard
I was oriented towards the model of the msi, but they have more or less the same price, so so I will take information also on the asus model, and i will choose the best for my needs