The goal of this post is to explain the methodology I will use to rank the gear.
The strategy and tactic that I choose will be to build a mathmatical model to assign a score to each piece of equipment.
Stat on the equipment will be weighed the same way they are in the Blizzard item formula. For example each point of stamina will be worth .67 points in the formula. By taking this approach, what essentially you are getting is a score of how well the item points are used on the item for what you want them used for. New pieces can be quickly added, and changed pieces updated and recalculated quickly.
For the moment we will assume 1 Expertise point cost 1 item point.
The first aspect of tanking gear are the mitigation stats. These are Armor, Defense, Block Rating, Parry, Dodge, Block Value, and Expertise.