The best replacement for instinct is learned behavior.

The best alternatives to instinct are rated as following:
★★★★★  learned behavior
★★★★★  intuition
★★★★  iphone
★★★  reason
★★★  reflex
★★  dare
★★  iphone 3g
★  blackberry
★  paranoia
★  intellect
★  impulse
★  instincts
★  learning
★  touch
★  voyager
★  emotion
★  insecurity
★  knowledge
★  drive
★  mortal kombat
★  behavior
★  curve
★  habit
  orijen
  instinct s30
  3g iphone
  treo
  treo 800w
  iphone 2
  gut feeling
  htc touch
  centro
  paranoid
  blackberry curve
  innate behavior
  scarpa
  lg dare
  innate
  omnia
  g1
  instinct hd
  behold

Your alternative for instinct is not listed? Suggest!
Speaking about instinct, one probably shouldn't forget about old sero plan.

Other search terms related to instinct and their ratings are:
★★★★★ old sero plan
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instinct
learned behavior
intuition