The best replacement for 6600gt is 7600gs.

The best alternatives to 6600gt are rated as following:
★★★★★  7600gs
★★★★  6800
★★★★  7600gt
★★★  7300gt
★★★  9800pro
★★  8500gt
★★  8600gt
★★  x700
★  8400gs
★  9800 pro
★  x800
★  7300gs
★  9800xt
★  6600
★  6800gt
★  intel hd 2000
★  9600xt
  9800
  g210
  6800le
  radeon 9800 pro
  x1600pro
  6800 xt
  5900xt
  radeon x1600
  radeon 9800
  x700pro
  geforce 6800
  x700xt

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Speaking about 6600gt, one probably shouldn't forget about bf2.

Other search terms related to 6600gt and their ratings are:
★★★★★ bf2
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Google Trends

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6600gt
7600gs
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