Altered Time - your #1 World of Warcraft Mage resource!

Do you guys think we actually need the 4set? Seems like it would mess up our rotation. It might be good with the legendary hat, but it seems pretty useless without it.

So I decided to put my arms warrior aside and pick up my mage again. Since i've always enjoyed arcane I decided to go with that. I've been looking up some information regarding the stats and I was wondering what the haste cap is exactly and if mastery is really much more important than crit. Thanks ...