The best replacement for 6300 is 6350.

The best alternatives to 6300 are rated as following:
★★★★★  6350
★★★★  8320
★★★  i3
★★★  4300
★★  8350
★★  5200
★★  6400
★★  3570k
★★  8120
★★  4670k
★★  6400 samsung
★  6350 samsung
★  professional series 500
★  7500
★  fx 8320
★  i3 4130
★  6233
★  4130
★  nokia 6120
★  965
★  6100
★  i5 3570k
★  6800
★  7100
★  4350
★  fx 8350
★  6320
  fx 6350
  vitamix 750
  5300
  6500
  killer 1103
  6600
  intel i5
  6288
  w810i
  6301
  760k
  amd fx 8320
  sony ericsson k550i
  nokia 6233
  vitamix 7500
  5310
  vitamix 5200
  nokia 5310
  nokia 5300
  4440
  6230
  e50
  hp 8300
  samsung 6500
  6400 series

Your alternative for 6300 is not listed? Suggest!
Speaking about 6300, one probably shouldn't forget about 770.

Other search terms related to 6300 and their ratings are:
★★★★★ 770
★★★★★ 760
★★★★★ 7970
★★★★ 280x
★★★★ 7950
★★★★ 7870
★★★ gtx 660
★★★ 780
★★ gtx 760
★★ gtx 770
★★ 7850
★ r9 270x
★ r9 280x
7770
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Google Trends

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6300
6350
8320