The best replacement for 84 is ti 83.

The best alternatives to 84 are rated as following:
★★★★★  ti 83
★★★★★  ti 89
★★★  64 bit
★★  85
★★  89
★★  ti 86
★  ti nspire
★  nad 83
★  bmc 85
★  83
★  86
★  ti 85
  ti-83
  browning bda 380
  nspire
  ti 84 silver
  ti-nspire
  ti nspire cx
  ti 84 plus
  ti 83 calculator
  cz 83
  ti-86
  el 34
  km184
  rtm 80
  rossignol e88
  ti 84 silver edition

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Speaking about 84, one probably shouldn't forget about weatherstrip.

Other search terms related to 84 and their ratings are:
★★★★★ weatherstrip
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84
ti 83
ti 89