The best replacement for 280x is 770.

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

Your alternative for 280x is not listed? Suggest!
Speaking about 280x, one probably shouldn't forget about 7970.

Other search terms related to 280x and their ratings are:
★★★★★ 7970
★★★ fx 6300
★★★ 8350
★★ i5 4670k
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Google Trends

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280x
770
7970