I've said it before, and I'll say it again: Gearing in Cataclysm is a no-brainer. Blizzard finally gets the needs of different classes and seems to be making gear that we actually want. Spirit plus haste gear is all over the place. So is mastery plus haste gear. And since almost everything worth getting has red sockets, we don't even need to do the math on what gem to use. And even with the "wrong" gear, reforging can make it almost as good as a best in slot.
There's one place where gearing up is still somewhat of a challenge, and that's the trinket slot. Instead of flat secondary stats, trinkets typically rely on procs with unspoken internal cooldowns and hard-to-theorycraft bonus damage.