The best replacement for 6000 is 7000 aluminum.

The best alternatives to 6000 are rated as following:
★★★★★  7000 aluminum
★★★  e6600
★★★  6003
★★  8000
★★  7000 series aluminum alloy
★★  7000 series aluminum
★★  specialized rockhopper
★★  7500
★★  600m
★★  7000 series
★  inspiron 600m
★  9000
★  9300
★  coolsat 5000
★  700m
★  fisher f5
  cannondale f5
  peg 8000
  k5000
  6050
  e6700
  rockhopper
  phenom ii
  6300 samsung
  6100
  gtx 690
  5000

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Speaking about 6000, one probably shouldn't forget about 7000.

Other search terms related to 6000 and their ratings are:
★★★★★ 7000
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6000
7000 aluminum
e6600