The best replacement for denon is onkyo.

The best alternatives to denon are rated as following:
★★★★★  onkyo
★★★★★  yamaha
★★★★  pioneer
★★★  marantz
★★  bose
★★  pioneer elite
★★  harman kardon
★  pioneer receiver
★  nad
★  integra
★  pioneer cdj
★  onkyo receivers
★  rotel
★  onkyo receiver
  yamaha receivers
  yamaha receiver
  onkyo sound quality
  marantz receiver
  onkyo which is better
  marantz av receiver
  yamaha av receivers
  yamaha avr
  marantz receivers
  sennheiser
  yamaha which is better
  mcintosh
  hk
  bose headphones
  harmon kardon
  pioneer receivers
  yamaha av receiver
  outlaw
  yamaha sound quality
  teac
  sony receivers
  numark

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

Other search terms related to denon and their ratings are:
★★★★★ klipsch
★★★ boston acoustics
★ zone 2
★ bose
kef
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