The best replacement for 1600 is 1333.

The best alternatives to 1600 are rated as following:
★★★★★  1333
★★★★★  1866
★★★  2133
★★★  1866 ram
★★★  2400 ram
★★  1333 ram
★★  2400 sat
★★  1866 memory
★  1333 memory
★  2400
★  2133 ddr3
★  1866 mhz ram
★  2133 memory
★  ddr3 1333
★  1650
★  mile
★  1800 ram
★  2133 ram
★  ddr3 2000
★  2600
  1866 ddr3
  1333 mhz ram
  nvidia 7600
  iso 3200
  1800
  ddr3 1866
  7600
  1066
  gene cafe
  tour v2
  1920
  1333 ddr3
  v2
  1600b
  2400 memory
  2400 mhz ram
  ddr3 2400

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Speaking about 1600, one probably shouldn't forget about 1333 ram.

Other search terms related to 1600 and their ratings are:
★★★★★ 1333 ram
★★ 1333
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1600
1333
1866