The best replacement for 3gs is 4.

The best alternatives to 3gs are rated as following:
★★★★★  4
★★★★★  3g
★★★★  iphone 4
★★  3g difference
★★  galaxy s
★★  4g iphone
★  blackberry bold
★  ipod touch 4
★  4s
★  samsung galaxy s2
★  4gs
★  samsung galaxy ace
★  iphone 4 review
★  palm pre
★  iphone 3g
★  4 iphone
★  3g how to tell
  3g iphone
  3g battery
  4s speed
  hd7
  htc inspire
  blackberry torch
  n8
  captivate
  galaxy ace
  samsung captivate
  samsung galaxy s
  htc wildfire s
  desire
  ipod touch
  htc aria
  blackberry storm 2
  4s battery life
  iphone 4gs
  htc desire
  iphone 4 specs
  3g screen
  iphone 4 processor
  nokia n97
  4 specs
  iphone 4g
  4 speed
  blackberry
  motorola droid
  blackberry bold 9700

Your alternative for 3gs is not listed? Suggest!
Speaking about 3gs, one probably shouldn't forget about ios 7.

Other search terms related to 3gs and their ratings are:
★★★★★ ios 7
★★★★★ ios 6
★★★★★ ios 5
★★★★ ipad baseband
★★ ios 5.1
★★ ios 5 slow
★★ sim activate
★★ aircel
★ shsh
★ no service
redsnow
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Google Trends

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