Hello. I'm very confused on what gpu should i buy. In my country Sapphire radeon r9 290 vapor-x OC is at the same price with Gigabyte GTX 780 GHz edition. I think to buy a 120hz screen too, to push the gpu to the limit. What do you think? (and i ask for 60hz monitor too, i'm not sure about the 120hz, answer for both options please 😀)