The best replacement for 1066 is 1333.

The best alternatives to 1066 are rated as following:
★★★★★  1333
★★★  1600
★★★  1067 ram
★★★  1333 fsb
★★  ddr2 800
★★  800
★★  1333 ram
★★  800 ddr2
★★  1333 ddr3
★  1866
★  1086
★  1067 ddr3
★  1600 mhz ram
★  ddr3 1333
★  800 ram
★  1333 memory
★  10600
★  800 fsb
★  ddr3 1600
★  10666
★  1333 mhz
  1333 macbook pro
  800 memory
  1068
  800 mhz
  ddr3 1066
  1033
  1033 ram
  2133

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Speaking about 1066, one probably shouldn't forget about 1333.

Other search terms related to 1066 and their ratings are:
★★★★★ 1333
★★★★ ddr2 800
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Google Trends

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1066
1333
1600