I hate to disappoint, but I don't think there is such a thing right now. If you use the elitist jerks spreadsheet, you'll find that even a slight tweak to how you value different stats will move pieces around the top 3-4 spots. "Best" is just too relative in this tier of gearing. Get used to having to gem and enchant up multiple pieces for the same slot.
To give you an idea, I carry 5 trinkets (EoG, VMofW, Lavanthor's, and Seal of Pantheon and the Mirror) 2 gloves, 2 sets of legs, 3 sets of boots, 2 shoulders, 2 chest pieces, 3 necks, 2 belts, 3 weapons, 2 shields.
And that's not counting my DPS gear... 20 slot bags are your friend in this expansion...
Just keep in mind that by mixing and matching you can raise your surviability at the expense of dps/threat. To be the best tank possible, I think you really need to be able to adjust that ratio on the fly.