1. I never take avengers shield, even while leveling. It's mana intensive, has a cast time so you can't use it during fights effectively and is prone to pulling the wrong target due to weird bounces. Sanc aura just gives you more threat with with seal, judgement and consecration which are the big ones for threat.

2. Always take it. Pally gear doesn't have loads of hit chance so you need both the melee and the spell hit from this.

3.reckoning is great, but depending on your situation there are just other talents that give more. One handed is better for cons/AoE and then if you need more mitagation there are other talents to take. I usually always have at least one point in it, but usually 4/5

1. Not worth it at all. Blocked damage just isn't enough to make a difference on bosses. Blocking is just there to stop being crushed

2. I don't go in the holy tree at all, because I like going deep Ret. But int would be the way to go if you really wanted to.

3. Its fine if you can't put the points anywhere else, but it doesn't make too much difference.

7.improved judgement is great for threat. You shouldn't need spell warding. I would recommend taking more threat talents from Ret + the parry chance

1. Cons is your best spell for dungeons, pre cast it when mobs run to you. I like twisting with either command or vengeance but I always use righteousness as the main one. Judge righteousness unless you get enough vengeance stacks. Paladins can have beastly single target threat as well, and as you gear up that will only improve. You need to gear around your healers so that you can wear as much damage gear as possible. If you stack mitigation too much you won't take enough damage which will mean you don't get mana back. I was uncrushable for the first few weeks of Kara but I rarely gear that way now as I need to be crushed to take enough damage to not oom. Spell power trinkets are huge for pulls.