The best replacement for 8600 is 8600 plus.

The best alternatives to 8600 are rated as following:
★★★★★  8600 plus
★★★★  8800
★★★  9500
★★★  210
★★★  6700
★★★  7520
★★  9600
★★  7900
★★  9400
★  276dw
★  7800
★  7600
★  epson 4530
★  epson 845
★  7510
★  2600
★  845
★  epson 3540
★  3650
  krzr
  hp office jet pro 8600 plus
  epson workforce 845
  epson 4540
  ati radeon™ hd 2600
  hp 8600 plus
  lg 8700
  8600 a
  7950
  6800

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Speaking about 8600, one probably shouldn't forget about airprint.

Other search terms related to 8600 and their ratings are:
★★★★★ airprint
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