I am planning on upgrading my gpu and monitor. I am going to be getting an Asus VG248QE. I need a gpu to go alongside this monitor, but I am not sure which one to buy. I am between the r9 290/290x and gtx 780/780ti. I want my system to be future proof as I will have these for awhile so that is why I am considering the 780 ti and 290x, but if the 780 or 290x will be fine for a few years, that is fine.