The best replacement for cs6 is cc.

The best alternatives to cs6 are rated as following:
★★★★★  cc
★★★★★  elements
★★★★★  cs5
★★★★  cs6 extended
★★★★  lightroom
★★★  photoshop cc
★★★  elements 12
★★★  cs4
★★  cs2
★  photoshop cs6 extended
★  cs3
★  creative cloud
★  cs7
★  cs 5.5
★  elements 11
★  cc premiere
★  lightroom 4
★  cs5 photoshop
  photoshop elements 11
  elements 10
  extended
  dreamweaver 8
  cc dreamweaver
  cs5 better
  photoshop elements

Your alternative for cs6 is not listed? Suggest!
Speaking about cs6, one probably shouldn't forget about creative cloud.

Other search terms related to cs6 and their ratings are:
★★★★★ creative cloud
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cs6
cc
elements