The best replacement for 6100 is 4170.

The best alternatives to 6100 are rated as following:
★★★★★  4170
★★★★★  6105 frets
★★★★  6300
★★★★  8120
★★★★  4100
★★★  6200
★★★  1100t
★★★  4300
★★★  6350
★★★  fx 4100
★★  6150
★★  965
★★  6105
★★  phenom ii x4 965
★★  1045t
★★  1090t
★  fx 4300
★  phenom x6
★  intel i5 2500k
★  6500
★  6110
★  6150 samsung
★  xpress 200
★  samsung a670
  fx 6300
  amd 1100t
  fx 8120
  fx 8150
  8150
  8100
  1055t
  phenom ii
  phenom ii x6
  motorola 2210
  6000
  2100

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Speaking about 6100, one probably shouldn't forget about linksys wrt54g.

Other search terms related to 6100 and their ratings are:
★★★★★ linksys wrt54g
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★★ linksys
★ gtx 760
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6100
4170
6105 frets