Looking at the OP, I find a lot of it seems to be focused on what we might call a Maintankadin. Many protection paladins often find themselves in a shared role for this and should take note of different strategies/gearing for different roles they might play. It can be very rewarding playing a prot paladin that is not maintanking (Morogrim, Al'ar come to mind first).
Gearsets for a Protection Paladin
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Main Tank Set: This set is designed for tanking the hardest hitters or progression content. Focus on maximizing stamina and armor while maintaining uncrushability. We are no different than warriors in this respect, as it has been proven that constant, low damage is far more healable than spike damage that you would gain by increasing avoidance instead of mitigation.
Threat Set: This set is designed for aoe fights or fast fights where you must obtain and build aggro very fast. Look for the paladin specific gear with spell damage, and spell damage trinkets like
[Eye of Magtheridon] and
[Icon of the Silver Crescent].
Block Value Set: This set is designed for aoe tanking many mobs for longer durations. The idea is to reduce the mob hits to near zero. The
[Item not found!] is great for this. 2.3 is introducing many new block value items as well. With a full block value set, a paladin will be able to block approximately 1000hp post-mitigation hits.
Non-tanking Damage Set: I haven't done the numbers to be honest, someone should probably get on it. Personally I use a spell damage set (my threat trinkets and the lamellar pvp gear, some of the tier items). I know some horde use a retribution style set with SoB instead of SoR. Irregarless, turn off Righteous Fury or you will die faster than an Enhance Shaman without salvation.
Healing Set: Do not take offense to being asked to heal. Some fights there just is not room for many tanks, and the best you can do for the raid is heal. This set should not be like a holy healing set, but rather focus on healing and mp5, as crit does little for a non-Illumiation build.
Additionally, you will want to get a set of 20 slot bags, as on any given raid you may use all 5 of these sets. Oh, and don't forget your resist gear for Hydross. Suckers!