The best replacement for 2600k is 3770k.

The best alternatives to 2600k are rated as following:
★★★★★  3770k
★★★★  2700k
★★★  3570k
★★★  4770k
★★★  2500k
★★  4670k
★★  4930k
★★  8350
★★  3770
★  3820
★  3930k
★  i7 950
★  i5 2500k
★  4820k
★  4770
★  980x
  3770k benchmark
  2600
  fx 8150
  i7 3770
  i5 3570k
  950
  i7 3820
  i7 3770k
  1090t
  i7 960
  3570k benchmark
  i7 3930k
  bulldozer
  i5 4670k
  i7 860
  960
  990x
  970
  i7 920

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Speaking about 2600k, one probably shouldn't forget about z77.

Other search terms related to 2600k and their ratings are:
★★★★★ z77
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