I am currently looking for a GPU that I can upgrade to. currently I have an AMD HD Radeon 6800 series and I am looking for an upgrade for around Christmas time, my PSU is a 750w. Mostly I am looking for a GPU that I can run most game at almost max, or relatively high setting and something that I can also run games in the next few years decently well. The games that I am looking to run is Star Citizen, Ark Survival Evolved, Fallout 4, Tom Clancy Division, Arma 3, GTA 5 on higher settings. I have a budget of 500$ and under. Any suggestions would be greatly appreciated.