The best replacement for 8.4 is 8.6 base curve.

The best alternatives to 8.4 are rated as following:
★★★★★  8.6 base curve
★★★★★  9.6 airsoft
★★★★  8.6 contacts
★★★★  8.8 base curve
★★★  8.5 base curve
★★★  9.6
★★  7.2
★★  8.8 acuvue oasys
★★  8.6
★★  8.7 base curve
★★  cognos 10
★  8.3
★  lg g pad 8.3
★  8.8 contacts
★  9.1
★  7.4 lipo
  8.7
  ipad mini retina

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8.4
8.6 base curve
9.6 airsoft