The best replacement for 6i is h700.

The best alternatives to 6i are rated as following:
★★★★★  h700
★★★  6s
★★★  forms 10g
★★  5i
★★  6 ir
★★  perc 5i
★★  mc5
★  h310
★  er 6
★  mazda 6s
★  shure e2c
  i9
  shure e3c
  h200
  i9 pill

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Speaking about 6i, one probably shouldn't forget about oracle 10g.

Other search terms related to 6i and their ratings are:
★★★★★ oracle 10g
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6i
h700
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