The best replacement for dc40 is dc41.

The best alternatives to dc40 are rated as following:
★★★★★  dc41
★★★★  dc50
★★★★  dc25
★★★  dc65
★★★  dc33
★★  dc28
★★  dc24
★★  dc50 garmin
★  dyson dc25
★  dc40 animal
★  dc39
★  dc44
★  dc40 origin
★  canon dc50
★  dyson dc33
  dc40i
  dyson dc50
  dyson dc41
  dc33 dyson
  dc 30

Your alternative for dc40 is not listed? Suggest!
Speaking about dc40, one probably shouldn't forget about dc25.

Other search terms related to dc40 and their ratings are:
★★★★★ dc25
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