The best replacement for 8.9 is nexus 10.

The best alternatives to 8.9 are rated as following:
★★★★★  nexus 10
★★★★  ipad air
★★★  10.1
★★  7 kindle fire hdx
★★  7.7
★★  9.7
★★  7 plus
★★  7.0 plus
★  nook hd+
★  kindle fire hdx 8.9
★  kindle fire hd 7
★  nook hd plus
★  zipp 808
  nook hd
  samsung galaxy tab 2
  google nexus 10

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Speaking about 8.9, one probably shouldn't forget about kindle fire hdx 8.9.

Other search terms related to 8.9 and their ratings are:
★★★★★ kindle fire hdx 8.9
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8.9
nexus 10
ipad air