Most wizard fights suck. No one thinks Saruman spinning Gandalf around in a circle is cool, its lame, as a matter of fact most magic in movies is lame. But holy shit the wizard fight between Dumbledore and Voldemort in Order of the Phoenix is kick ass. It has everything that I want in a wizard battle, fireballs, fire serpents, water globes, spells flying that I can't even describe, and Voldemort is one scary ass mofo.
I want the magic in my games to look and feel like that movie scene. Even if you don't like Harry Potter, watch the end of Order of the Phoenix and let this amazing wizard duel blow your mind and inspire you for a game.