The best replacement for photoshop cs5 is elements 9.

The best alternatives to photoshop cs5 are rated as following:
★★★★★  elements 9
★★★★  lightroom
★★★★  photoshop cs5 extended
★★★  cs5 extended
★★  lightroom 3
★★  photoshop elements
★  photoshop elements 8
★  elements 11
★  aperture 3
  photoshop elements 9
  photoshop elements 11
  elements 10
  gimp
  elements 8
  lightroom 4
  paint shop pro

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Speaking about photoshop cs5, one probably shouldn't forget about camera raw.

Other search terms related to photoshop cs5 and their ratings are:
★★★★★ camera raw
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photoshop cs5
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