Mage SOD Armor

[Andorrabell]

The following tables are courtesy of Wire

Group Parity

Raid Parity

Heroic Intelligence

Spell Damage

[Redius]

http://lsd.ozzy.no/armor_stats.php

that's a great website for all classes and all tiers of group and raid armor. It even lets you sort on 2 different variable to make armor. Very handy.

[Sillaen]

That's a nice tool. The only thing I didn't like about it is that it seems to select the one with the least amount of mods if the mods your are searching on are equal on more than 1 pieces. For example it picks Tarnished for T5 group legs over Tainted even though Tainted has more overall mods. Still an excellent guideline if you don't want to go through the trouble yourself.