The best replacement for 850 is v70.

The best alternatives to 850 are rated as following:
★★★★★  v70
★★★★  1900
★★★★  s70
★★★  940
★★★  900
★★  840
★★  2100 3g
★★  550
★  900 cdj
★  can am 800
★  gsm 900
★  950q
★  2100
★  cdj 1000 mk3
★  1310
★  brute force 750
★  pilatus
★  pilatus pc-12
  renegade 800
  pc12
  big jambox
  outlander 800
  960
  grizzly 700
  cdj 900
  piper meridian
  740
  sportsman 850
  tdm 900
  can am 1000
  pc 12
  hs 810
  can am
  arctic cat 1000
  sd 870
  880
  800 canam

Your alternative for 850 is not listed? Suggest!
Speaking about 850, one probably shouldn't forget about rekordbox.

Other search terms related to 850 and their ratings are:
★★★★★ rekordbox
★★★★ serato
You have in mind a companion for 850 and it is not yet here? Propose!



Google Trends

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850
v70
1900