The best replacement for 3870k is 5800k.

The best alternatives to 3870k are rated as following:
★★★★★  5800k
★★★★  3850
★★★★  5600k
★★★  fx 4100
★  3670k
  fx-4100

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Speaking about 3870k, one probably shouldn't forget about 6670.

Other search terms related to 3870k and their ratings are:
★★★★★ 6670
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3870k
5800k
3850