After much consideration...I must digress...I LOVE the Hysteria spell.

Probably Equilibrium - I love the idea of a spell that not only benefits you but also harms you, i forces you to be much more strategic.

Not if you have restoration magic.... just saying, you become a better mage by using your health to get magic, then heal when you get low....although this isnt very advisable in a epic battle...

I've not become a fan of any particular spell, but I like the 2xsummon X-Thralls you get at mastery of Conjuration. At that point I become almost a spectator as my thralls, follower, dog and horse all swarm in.

Calm/pacify

Sit down.

Fury. It's so much fun to sneak-cast it to people I hate like Nazeem or Heimskr and see them go into a killing rampage (and get promptly killed a few moments later by the guards). Never fails to crack me up

Ice Spear.

Favorite Shout is maxed out Throw Voice.

Hysteria is fun, seeing Bandits cower in fear with their hands over their heads, who then run away screaming the minute you get close to them! I would have to say my faveourite is a toss up between Pacify and Invisibilty, without these I would not be able to function!

Good ol' healing. Love the sound and how it saved my ass in several occasions.

Fury is my favorite. I love to sneakily cast in a room full of bandits and sit back with a bag of popcorn.