I have a budget of around RM500, was wondering what is a good graphics card upgrade (new or used) ? I am coming from a 5 year old R5770 and I have an i5 750 cpu.

I play mostly games like World of Warcraft, Cities Skylines and racing/sports games like Grid/Fifa/PES. Looking to have decent 1080p performance for these games..

Saw a few R280x / GTX 770 selling in garage sales, but maybe you guys have a better recommendation for my budget. Thanks!