The best replacement for k100 is k101.

The best alternatives to k100 are rated as following:
★★★★★  k101
★★★★  magneto
★★★  nemesis clone
★★★  k200
★★★  nikon d40
★★★  k100+
★★★  vamo
★★★  k75
★★  startron
★★  chi you
★  kpro
★  sentinel clone
★  kts
★  blueant s4
★  k101 mod
  k10
  blueant
  olympus e500
  evic

Your alternative for k100 is not listed? Suggest!
Speaking about k100, one probably shouldn't forget about nimbus.

Other search terms related to k100 and their ratings are:
★★★★★ nimbus
★★★★★ protank
★★★★★ igo w
★★★ rda
★★★ kanger protank 2
★ vivi nova
★ kanger protank
You have in mind a companion for k100 and it is not yet here? Propose!



Google Trends

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k100
k101
magneto