The best replacement for 8520 is 8530.

The best alternatives to 8520 are rated as following:
★★★★★  8530
★★★★  9300
★★★★  8900
★★★  9320
★★★  9360
★★★  9220
★★  e5
★  9700
★  bold 9700
★  8320
★  curve 3g
★  nokia e5
★  blackberry 8900
★  9000
★  9380
★  nokia e71
★  9720
★  9780
★  9300 curve
  samsung galaxy y
  8310
  curve 9300
  blackberry bold 9700
  bold 9780
  galaxy y
  8250
  bold 9000
  8900 blackberry
  9810
  nokia c3
  nokia e72
  curve 8900
  8530 curve
  blackberry 8530
  bb 8900

Your alternative for 8520 is not listed? Suggest!
Speaking about 8520, one probably shouldn't forget about os6.

Other search terms related to 8520 and their ratings are:
★★★★★ os6
★★★ camera flash
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Google Trends

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