The best replacement for antec 900 is haf 922.

The best alternatives to antec 900 are rated as following:
★★★★★  haf 922
★★★  cooler master haf
★★★  nzxt phantom
★★★  corsair 500r
★★★  haf 932
★★  nzxt tempest
★★  storm scout
★  thermaltake v9
★  thermaltake armor
★  corsair 400r
★  p182
★  p180
★  tempest
★  cm 690
  antec 1200
  nzxt apollo
  cm storm scout

Your alternative for antec 900 is not listed? Suggest!
Speaking about antec 900, one probably shouldn't forget about cooler master v8.

Other search terms related to antec 900 and their ratings are:
★★★★★ cooler master v8
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antec 900
haf 922
cooler master haf