The best replacement for r9 280x is gtx 770.

The best alternatives to r9 280x are rated as following:
★★★★★  gtx 770
★★★★  7970
★★★★  gtx 760
★★★  gtx 780
★★★  r9 290
★★★  7950
★★  r9 290x
★★  r9 270x
★  7870
★  gtx 680
★  hd 7970
★  gtx 670
★  770
★  7970 ghz
★  gtx 770 4gb
  r9 280
  660 ti
  760

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Speaking about r9 280x, one probably shouldn't forget about i5 4670k.

Other search terms related to r9 280x and their ratings are:
★★★★★ i5 4670k
★★★★ fx 6300
★ fx 8350
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Google Trends

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r9 280x
gtx 770
7970