The best replacement for d900 is d900i.

The best alternatives to d900 are rated as following:
★★★★★  d900i
★★★★★  e900
★★★★  k800i
★★★  u600
★★  k800
★★  sony ericsson k800i
★  d800
  d600
  samsung e900
  d807
  k790

Your alternative for d900 is not listed? Suggest!
Speaking about d900, one probably shouldn't forget about e900.

Other search terms related to d900 and their ratings are:
★★★★★ e900
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d900
d900i
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