The best replacement for q300 is q320.

The best alternatives to q300 are rated as following:
★★★★★  q320
★★★★★  n1
★★★★★  spt
★★★  n1 wrx
★★★  n1 s2000
★★  ls50
★★  r100
★★  nameless
★★  full race
★★  q500
★★  turboxs
★  685
★  tannoy dc6
★  monitor audio bx2
★  q320 weber
★  monitor audio bx5
★  r300
★  b&w 685
  q100
  kef q500
  bx2

Your alternative for q300 is not listed? Suggest!
Speaking about q300, one probably shouldn't forget about marantz pm6004.

Other search terms related to q300 and their ratings are:
★★★★★ marantz pm6004
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q300
q320
n1