The best replacement for samsung omnia is blackberry storm.

The best alternatives to samsung omnia are rated as following:
★★★★★  blackberry storm
★★★★  lg dare
★★  iphone 3g
★★  storm
★★  nokia 5800
★★  htc diamond
★  apple iphone
★  htc touch pro
★  pixon
  lg versa
  lg arena
  samsung behold
  htc touch hd

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Speaking about samsung omnia, one probably shouldn't forget about windows mobile 6.5.

Other search terms related to samsung omnia and their ratings are:

★★★★★ windows mobile 6.5
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Google Trends

Scale is based on the average worldwide traffic of samsung omnia in all years. Click on graph for more.
samsung omnia
blackberry storm
lg dare