Like was said before...
the Defense Requirement to be uncritable is 540. Other stats as Parry,Dodge and Block have no requirements, but the higher ya can get the better.
Also... after the cap you should aim for Hit Rating, which i believe the cap for melee is 265, people correct me if 'm wrong. and last but not least Expertise cap is 17, but some say it's not required. Specially as a pally prot tank, since most of the aggro will be generated via Holy Damaging spells and abilities.
You can look over my Armory, Toon: Eowina Server: Aerie Peak
I'll give you a brief list of easy gear to get running heroics for Emblems and through Crafting.
Which means you won't need to relly on Boss Drops to get them.
Head --> [Epic] Tempered Titansteel Helm : You can have a blacksmith craft for ya
Neck --> [Epic] Chained Military Gorget : Purcharsed with Emblems of Heroism
Chest --> [Rare] Breastplate of the Solemn Council : Revered with Wyrmrest Accord
Feet --> [Epic] Tempered Titansteel Treads : also made by Blacksmith
Wrist --> [Rare] Tempered Saronite Bracers : Blacksmithing also
Ring 1 --> [Epic] Titanium Earthguard Ring : Made by Jewelcrafter
Trinket 1 --> [Epic] Valor Medal of the First War : Emblems of Heroism
Back --: [Epic] Durable Nerubhide Cape : Made by Leatherworker
Shield --> [Epic] Crygil's Discarded Plate Panel : Emblems of Heroism
Libram --> [Epic] Libram of Obstruction : Emblems of Heroism
