The best replacement for 8 pro is windows 8.

The best alternatives to 8 pro are rated as following:
★★★★★  windows 8
★★★★  8
★★★  windows 8.1
★★★  windows 7 ultimate
★★★  rt
★★  pro pack
★  windows 7 pro
★  windows 8 enterprise
★  nexus 7 2013
★  windows 8 pro pack
★  microsoft surface 2
★  miix2
★  11 pro
★  toshiba encore
★  asus t100
  windows rt
  windows 7 professional
  win 8

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Speaking about 8 pro, one probably shouldn't forget about media center.

Other search terms related to 8 pro and their ratings are:
★★★★★ media center
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