The best replacement for k20a is k20a2.

The best alternatives to k20a are rated as following:
★★★★★  k20a2
★★★★  b18c
★★★  k20z
★★★  f20c
★★  k20z3
★★  k24
★★  k24a2
★★  k20z1
★  k20a3
★  h22a
★  b18c5
★  k24a
  b18c type r
  b16a
  sr20ve
  k20z4
  r20a
  4b11t

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Speaking about k20a, one probably shouldn't forget about itbs.

Other search terms related to k20a and their ratings are:
★★★★★ itbs
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k20a
k20a2
b18c