The best replacement for e8400 is q6600.

The best alternatives to e8400 are rated as following:
★★★★★  q6600
★★★★  e8500
★★★  e8600
★★  q8400
★★  q8200
★★  q9550
★★  e6850
★★  e7500
★  q9650
★  q9400
★  q9300
★  e6550
★  g3220
★  e6600
★  q8300
  phenom ii x2
  e6700
  q9450
  e6750
  phenom
  e2180
  e7600
  e5200
  g630
  phenom 2
  q6700
  i3 3220
  e3110

Your alternative for e8400 is not listed? Suggest!
Speaking about e8400, one probably shouldn't forget about 7850.

Other search terms related to e8400 and their ratings are:
★★★★★ 7850
★★★★ 6850
★★★ 6870
★★ 7870
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e8400
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