The best replacement for 6700 is 6800.

The best alternatives to 6700 are rated as following:
★★★★★  6800
★★★★  8600
★★★  6701 chain
★★★  5700 cassette
★★★  6750 ultegra
★★  6800k
★★  dura ace 7900
★★  6600
★★  sram force
★★  7900
★★  6750
★★  sram rival
★★  7600
★★  treo
★★  treo 650
★  dura ace 7800
★  5700
★  6303
★  7800
★  rs 80
★  rs80
★  sram red
★  700p
★  treo 700
  ppc 6800
  hp 8600
  700w
  hp 7520
  6703
  treo 700w
  7525
  8125
  hp 7525
  650

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Speaking about 6700, one probably shouldn't forget about 6600.

Other search terms related to 6700 and their ratings are:
★★★★★ 6600
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