The best replacement for k20a3 is k20a2.

The best alternatives to k20a3 are rated as following:
★★★★★  k20a2
★★★★  k20z3
★★★  b18c1
★★★  k20z1
★★★  k20a
★★★  b16
★★  k24a4
★★  b16a2
★★  k24a1
★  k20a2 crank
★  b18c5
  d17a2
  k20z2
  k20a4

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Speaking about k20a3, one probably shouldn't forget about a2 head.

Other search terms related to k20a3 and their ratings are:
★★★★★ a2 head
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k20a3
k20a2
k20z3