An R9 390X is probably the best bang for the buck at that price point. Depending on the game, it can run with higher FPS than a GTX 980 or Fury. The downside is that it is quite power hungry and would require a good 700 watt PSU.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202185&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=