The best replacement for q6600 is i7.

The best alternatives to q6600 are rated as following:
★★★★★  i7
★★★★  e8400
★★★★  e6850
★★★★  q8200
★★★  q9300
★★  e6600
★★  q6700
★★  phenom
★★  q9550
★★  e6750
★  e8500
★  q9650
★  q9450
★  core i7
★  q9400
★  phenom ii
★  q8300
★  e6700
★  phenom 2
★  i7 920
  athlon ii x4
  i5 4670k
  qx6700
  q8400
  6850
  phenom ii x4
  x6800
  g3220
  q6850
  qx6800
  fx 74
  e7400
  intel core 2 duo e6850

Your alternative for q6600 is not listed? Suggest!
Speaking about q6600, one probably shouldn't forget about ddr3.

Other search terms related to q6600 and their ratings are:
★★★★★ ddr3
★★★ gtx 760
★★ gtx 660
★★ 7850
★ 560ti
★ 7870
★ 7950
6870
6950
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Google Trends

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q6600
i7
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