The best replacement for kx is kr.

The best alternatives to kx are rated as following:
★★★★★  kr
★★★★  yz
★★★  kdx
★★★  k7
★★★  cr
★★★  klx
★★  nikon d5000
★★  ktm
★★  k30
★★  rm
★  canon t1i
★  d3100
★  yz 125
★  pentax kr
★  k5
★  k10d
★  k20d
★  nikon d3100
  nikon d3000
  zx
  cl
  k20
  sony a230
  k200d
  d5000

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Speaking about kx, one probably shouldn't forget about old pentax lenses.

Other search terms related to kx and their ratings are:
★★★★★ old pentax lenses
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Google Trends

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kx
kr
yz