What Fred said.
It would help to know if you're a stamsorc or a magsorc. And what weapons you're using.
Personally when I feel like my stamsorc needs more defense I use Quick Cloak+hurricane to keep crit surge going. When I feel like I need more damage I replace Quick Cloak with Caltrops.
I keep the fighters guild major prophecy on my bar regardless... There's the minor berserk to consider as well. Also-- and Fred touched on this as well-- IF you are a stamsorc you're going to want to stack spell damage instead of weapon damage so you can get your minor prophecy as well. And you may find potions that return stamina more useful than potions that return magicka. Well, stam pots will give you savagery but not prophecy. So you prolly need to keep major prophecy on your bar.