The best replacement for 4.3 is 16.9.

The best alternatives to 4.3 are rated as following:
★★★★★  16.9
★★★★★  4.4
★★★  4.2
★★★  4.2.2
★★  4.8
★★  4.4.2
★★  5 inch gps
★★  4.1.2
★  4.0
★  4.1
★  16.9 dvd
★  kitkat
★  16.9 ratio
★  305
★  4.1 android
★  4.2.2 android
★  ios 7
★  16.9 tv
★  16.9 aspect ratio
★  3.8
★  5 inch
  4.3.1
  4.4 note 3
  ford 4.0
  2.8
  ios7
  4.0 gpa
  4.2.1
  4.4.2 android
  3.5 gps
  4.3u
  4.3 vortec

Your alternative for 4.3 is not listed? Suggest!
Speaking about 4.3, one probably shouldn't forget about root.

Other search terms related to 4.3 and their ratings are:
★★★★★ root
★★ homebrew
★ iphone 3g
You have in mind a companion for 4.3 and it is not yet here? Propose!



Google Trends

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4.3
16.9
4.4