The best replacement for 7850 is 7870.

The best alternatives to 7850 are rated as following:
★★★★★  7870
★★★★★  660
★★★  650 ti
★★★  7790
★★★  7770
★★★  760
★★  7950
★★  gtx 660
★★  6870
★★  6950
★★  r9 270x
★★  r7 260x
★★  650 ti boost
★  260x
★  750 ti
★  270x
★  r9 270
★  6850
★  660 ti
★  560 ti
★  245
★  7750
★  gtx 650
  650
  770
  6970
  560ti
  gtx 570
  8650
  270
  7970
  570
  670
  560
  hd 6950

Your alternative for 7850 is not listed? Suggest!
Speaking about 7850, one probably shouldn't forget about q6600.

Other search terms related to 7850 and their ratings are:
★★★★★ q6600
★★★★ e8400
★★★ 3570k
★★★ i3 3220
★★★ mantle
★★ a10
★ fx 6300
★ 7870
★ 2500k
★ 6850
7770
6950
fx 4100
7870 crossfire
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Google Trends

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7850
7870
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