The best replacement for instant yeast is active dry yeast.

The best alternatives to instant yeast are rated as following:
★★★★★  active dry yeast
★★  rapid rise yeast
★★  fresh yeast
★★  active dry
★★  bread machine yeast
★★  active yeast
★  baking powder
★  dry yeast
★  yeast
★  regular yeast
★  quick rise
★  fast rise yeast
★  quick rise yeast
★  rapid rise
★  dry active yeast
★  highly active yeast
  nutritional yeast
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  cake yeast
  instant dry yeast
  active
  compressed yeast
  fast acting yeast
  traditional yeast
  red star quick rise yeast
  activated yeast
  pizza yeast
  dry active
  rapid rising yeast

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Speaking about instant yeast, one probably shouldn't forget about active dry yeast.

Other search terms related to instant yeast and their ratings are:
★★★★★ active dry yeast
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instant yeast
active dry yeast
rapid rise yeast