The best replacement for r7 260x is 7850.

The best alternatives to r7 260x are rated as following:
★★★★★  7850
★★★★★  gtx 650
★★★★  r9 270x
★★★★  7770
★★★  7790
★★★  gtx 750
★★★  gtx 660
★★★  gtx 650 ti
★★★  7870
★★  750 ti
★★  r7 265
★  6870
★  6850
★  5770
★  hd 6870
★  7750
★  gtx 560
★  hd 7770
★  6950
  gtx 460
  560 ti
  hd 7850
  650 ti boost
  gtx 560 ti
  gtx 660 ti

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Speaking about r7 260x, one probably shouldn't forget about kaveri.

Other search terms related to r7 260x and their ratings are:
★★★★★ kaveri
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r7 260x
7850
gtx 650