The best replacement for gandalf is dumbledore.

The best alternatives to gandalf are rated as following:
★★★★★  dumbledore
★★★  balrog
★★★  saruman
★★★  sauron
★★  witch king
★  darth vader
★  voldemort
★  dumbledore facebook
★  smaug
★  yoda
★  necromancer
  merlin
  harry potter
  azog
  dumbledore failbook
  nazgul
  thrain
  captain planet
  witch king of angmar
  mumford and sons
  mumford
  dumbledore rap battle
  witch-king

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Speaking about gandalf, one probably shouldn't forget about time that is given to you.

Other search terms related to gandalf and their ratings are:
★★★★★ time that is given to you
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gandalf
dumbledore
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