The best replacement for 4200 is pc2 5300.

The best alternatives to 4200 are rated as following:
★★★★★  pc2 5300
★★★★  5200
★★★★  4200xl
★★★★  5200 magimix
★★★  4000
★★  zeiss conquest
★★  nikon monarch
★★  5400
★★  gransport
★★  3200
★★  5300
★★  4400
★  4300
★  vortex viper
★  pc 4200
★  leupold vx 3
★  ati radeon x1800
★  pc 6400
  3800
  pc2 4300
  pc 5300
  pc2-4300
  5300 ram
  pc2-5300
  7200
  e6300
  ddr2-667mhz pc2-5300
  5200 3m
  pc4200
  monarch
  4500
  ddr2 667mhz pc2 5300

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Speaking about 4200, one probably shouldn't forget about pc2 5300.

Other search terms related to 4200 and their ratings are:
★★★★★ pc2 5300
pc2-5300
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