The best replacement for hd800 is t1.

The best alternatives to hd800 are rated as following:
★★★★★  t1
★★★★  lcd2
★★★★  hd650
★★★★  ps1000
★★★  lcd3
★★★  hd700
★★★  beyerdynamic t1
★★★  tesla t1
★★★  he500
★★  lcd-x
★★  hd600
★★  he6
★★  grado ps1000
★  k812
★  gs1000
★  dt880
★  stax
★  lcd 3
★  stax 009
★  th900
★  audeze lcd3
  he-6

Your alternative for hd800 is not listed? Suggest!
Speaking about hd800, one probably shouldn't forget about wa6.

Other search terms related to hd800 and their ratings are:
★★★★★ wa6
★★★ schiit lyr
You have in mind a companion for hd800 and it is not yet here? Propose!



Google Trends

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hd800
t1
lcd2