The best replacement for iii is iv.

The best alternatives to iii are rated as following:
★★★★★  iv
★★★★  iiia
★★★  detective conan
★★★  siii mini
★★★  22 45
★★★  basel ii
★★★  nikon d800
★★★  sata ii
★★★  galaxy note
★★★  wisc iv
★★★  dexron vi
★★  pentium iv
★★  wais-iv
★★  5d
★★  d800
★★  usb 3.0
★★  iweb
★★  conan
★★  vice city
★★  scrivener
★  mark ii
★  note ii
★  ultra ii
★  ucits iv
★  buckmark
★  6d
★  digic ii
★  xda iis
★  canon 6d
★  browning buckmark
★  diamond atf sp iii
★  one x
★  s ii
★  dsm iv
★  digic iv
★  rock band
★  master cardiology
★  apple 5
★  ii
★  bs iv
★  sata
★  yuma
★  andrew luck
★  htc one x
★  htc one
★  wais iv
  sirf ii
  evo lte
  petzlife
  mmpi 2
  razr maxx
  samsung galaxy s ii
  civilization iv
  digic 4
  samsung galaxy note

Your alternative for iii is not listed? Suggest!
Speaking about iii, one probably shouldn't forget about severe dysplasia.

Other search terms related to iii and their ratings are:
★★★★★ severe dysplasia
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iii
iv
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