The best replacement for nano is touch.

The best alternatives to nano are rated as following:
★★★★★  touch
★★★★★  shuffle
★★★★★  micro
★★★  classic
★★★  vi
★★★  shield
★★  ipod touch
★★  vim
★★  ipod
★★  pico
★★  micro sim
★  zune
★  glock 26
★  itouch
★  atom
★  shuffle for running
★  lc9
★  video
★  ipod classic
★  cm9
★  xds
★  mini
★  ipod shuffle
★  milli
★  ruger lc9
★  micro smaller
★  nano 2.0
  pm9
  emacs
  ipod video
  ipod mini
  kahr cm9
  inov 8
  walther pps
  lcp
  shuffle which was first
  pps
  classic ipod
  pico smaller
  zen micro
  sansa
  sig p290
  sony walkman
  mp3 player
  smart car
  micro sim card
  shuffle which came first
  zen

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Speaking about nano, one probably shouldn't forget about syntax highlighting.

Other search terms related to nano and their ratings are:
★★★★★ syntax highlighting
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Google Trends

Scale is based on the average worldwide traffic of nano in all years. Click on graph for more.
nano
touch
shuffle