The best replacement for sigma lens is tamron lens.

The best alternatives to sigma lens are rated as following:
★★★★★  tamron lens
★★★★  nikon lens
★★★  canon lens
★★  tamron
★★  nikkor
★  nikkor lens
  nikon lens review
  pentax

Your alternative for sigma lens is not listed? Suggest!
Speaking about sigma lens, one probably shouldn't forget about 450d.

Other search terms related to sigma lens and their ratings are:
★★★★★ 450d
★★★ d200
★★★ nikon d3100
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