I will buy a new gaming pc in march with a ryzen 7 2700, but i dont know which graphics card should i buy. In my country i can get the rx 580 around 120k ft, the vega 56 around 185k ft, and a gtx 1070 about 150-160k ft. Which should I buy? I already have my monitor, it supports freesync. (75hz, 1080x2560 resolution)