The best replacement for blackberry curve is iphone.

The best alternatives to blackberry curve are rated as following:
★★★★★  iphone
★★★★★  bold
★★★★  pearl
★★★  blackberry bold
★★  tour
★★  blackberry pearl
★★  torch
★  8800
★  iphone 3g
★  8830
★  palm centro
★  treo 750
★  blackberry tour
  blackberry 8800
  world edition
  samsung instinct
  htc aria
  bold 9650
  lg dare
  blackberry style
  samsung intercept
  bold 9700
  palm pre
  samsung blackjack
  blackberry torch
  blackberry storm
  palm treo
  nokia e5
  blackberry 8820
  droid pro
  blackjack 2
  lg optimus
  blackjack ii
  palm 750

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Google Trends

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blackberry curve