The best replacement for 5300 is 6400.

The best alternatives to 5300 are rated as following:
★★★★★  6400
★★★★★  6400 memory
★★★★  5500
★★★★  5200
★★★  pc2 5400
★★★  pc2 6400
★★★  pc2 4200
★★  5300s
★★  5400
★★  5100
★★  6400 ram
★★  pc 5400
★★  pc2 5300s
★  6300 samsung
★  4965
★  5300u
★  nokia 5200
★  4200
★  5700
★  pc5300
  pc2
  6300
  pc2-6400
  3200
  ddr2 pc2 4200
  pc2 5300
  pc 6400
  pc 5300
  pc2-5400
  6233
  pc5400
  ddr2 6400
  ddr2 pc2 6400
  pc2-5300s
  pc2 4300

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Speaking about 5300, one probably shouldn't forget about pc2 6400.

Other search terms related to 5300 and their ratings are:
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5300
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