The best replacement for 3770k is 4770k.

The best alternatives to 3770k are rated as following:
★★★★★  4770k
★★★★  3570k
★★★  2600k
★★★  4670k
★★★  8350
★★  4820k
★★  3930k
★★  3770
★★  2500k
★★  2700k
★★  4930k
★★  3820
★  4770
★  i5 3570k
★  i7 4770k
★  4770k overclock
★  fx 8350
★  i7 2700k
  fx 9590
  3570k gaming
  4960x
  920
  i7 3820
  i7 3770
  i7 3930k
  i7-3930k
  i7 2600k

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Speaking about 3770k, one probably shouldn't forget about h100.

Other search terms related to 3770k and their ratings are:
★★★★★ h100
★★★★★ h80
★ z68
690
asus z77 sabertooth
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