Borsuk wrote:
With Losie already chiming in, I'll only offer a few points:
1. You do not need 540 when you hit 80. At 80 you begin gear collection - thus you're doing heroics. You should consider 540 the DEF CAP for Raids. 535 is the Def Cap for Heroics. Over Def'ing a heroic is not worth it. As you're a paladin, your STA will likely need a boost early on. Subbing a +STA gear in for something is probably worth it so long as your are near that 535 mark. Don't gear for 540 till you hit Naxx.
1a. You should have 540 Gear at all times. Save your gear - I've noticed that sometimes I need to swap one piece for another due to Def-Cap requirements. Don't discard old gear until it's really old... You never know when you'll need that +Def trinket or gloves, etc. In order to equip a new piece that might be lower in DEF, but give you an overall stat boost.
2. You can run heroics with less than def cap. My advice is to go in initially with a number very close to 535, but with as much STA as possible. If you notice you're eating a lot of crits - then bump up the DEF. Perhaps someone like Losie could tell you the % chance to get crit with Def at 525, 530. (I had a guildie Warrior who Tank Nexus with 517.) Your ability to take a crit is directly related to your stamina and the healer's ability. OP healer = No Prob.
You can easily get to 689 defense rating at level 78 as a Prot Paladin, so why not do it? Also, there is no "Defense Cap". You see that term a lot and it is wildly inaccurate. 535 Defense will get you uncrittable for heroics, 540 will get you uncrittable for raids. Any defense OVER 540 adds to you overall avoidance, so you are NOT "capped" at 540. More is still better.
There IS a Block Cap however; 102.4% avoidance with holy shield up will still assure that you only take blocks, parries, dodges, and misses and never eat a regular hit. You should strive (eventually) to have a minimum of 540 defense and also a total avoidance of 102.4%. This takes a while to achieve. Once you are at 540/102.4 all you really have to worry about is stamina. (There is more to it than that, but that is the simple version).
Yes, you can do heroics with less than 535 defense, but as easy as it is to get to 535 defense, why bother? In my opinion, UK is by far the easiest, Drak'Tharon Keep is easy as well, Nexus is easy, especially if you use appropriate resistance auras when necessary, and Violet Hold is easy if your DPS can down the bosses quickly. Xevozz in VH is a pain, but if you tank him in the water with your back against the gate, it makes the orbs inoperable and it becomes just a tank & spank. He doesn't hit hard, and his spells are pretty weak too.
As a new 80 tank with around 540 defense and 22k health, I would say do those 4 a few times to start out until you gear up some more. There is a decent tanking sword that drops in H UK (not as good as the one in H UP, but H UP is much tougher), a great trinket in H VH, Purple tank pants in H VH, and I think there is a blue necklace for tanks in H DTK iirc. I don't remember there being any spectacular tank drops in H Nexus, but it IS 5 emblems.
15 emblems will get you a Libram of Obstruction. After that I would probably go for the emblem necklace or belt depending on your personal needs, although you can always just save up and get the T7 chest/gloves before anything else if you want (although I would STILL get the Libram of Obstruction with the first 15 emblems that you get).
Also, don't forget to Champion. Some of the Rep rewards are quite good.
Finally, even if you are a new tank with right at 540 defense and only 22k health, if someone invites you to OT Naxx, just do it, especially if the rest of the group is good and has done it before. You can OT in there just fine as a fresh 80. I wouldn't recommend Main Tanking in there until you have about 24-25k health.