The best replacement for 821 is 921.

The best alternatives to 821 are rated as following:
★★★★★  921
★★★★  denon 1612
★★★  rm-820
★★★  823
★★★  521
★  vsx-521
★  vsx-921
★  796
  denon 1312
  onkyo 509

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821
921
denon 1612