The best replacement for touch pro is touch pro 2.

The best alternatives to touch pro are rated as following:
★★★★★  touch pro 2
★★★★  diamond
★★★  touch diamond
★★  palm pre
★★  samsung omnia
★★  htc diamond
★★  omnia
★  htc touch pro 2
★  touch hd
★  htc touch diamond
  samsung instinct
  pro 2

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Google Trends

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touch pro
touch pro 2