The best replacement for oppo is marantz.

The best alternatives to oppo are rated as following:
★★★★★  marantz
★★  pioneer elite
★★  htpc
★  zopo
★  dune
★  cambridge audio
★  xiaomi
  helios
  denon blu-ray
  pioneer blu ray
  lenovo
  arcam
  dvdo edge
  marantz blu ray
  hd a1
  denon dvd

Your alternative for oppo is not listed? Suggest!
Speaking about oppo, one probably shouldn't forget about roku streaming stick.

Other search terms related to oppo and their ratings are:
★★★★★ roku streaming stick
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oppo
marantz
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