The best replacement for 6850 is 7770.

The best alternatives to 6850 are rated as following:
★★★★★  7770
★★★★  6870
★★★  6950
★★★  7870
★★★  7850
★★  560 ti
★★  550 ti
★★  gtx 460
★★  gtx 560
★★  7790
★★  650 ti
★★  5850
★★  7750
★  gtx 550
★  5770
★  460
★  5870
★  r7 260x
★  650
★  gtx 550 ti
★  570
★  270x
★  gtx 560 ti
  hd 7770
  6870 crossfire
  5770 crossfire
  560
  550
  hd 6770
  6770
  770
  5830
  4870
  hd 7750
  ati 5850
  660 ti
  q6600
  gtx 470

Your alternative for 6850 is not listed? Suggest!
Speaking about 6850, one probably shouldn't forget about 6870 crossfire.

Other search terms related to 6850 and their ratings are:
★★★★★ 6870 crossfire
★★★ e8400
★★★ a8
★★ 2500k
★★ 7850
★★ 4850 crossfire
★ 5770
★ 5850
4850
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6850
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