My guild only does 10 mans, and we've recently cleared Ulduar and a few hard modes (Flame Leviathan +4 and Iron Council hard). I've never really tanked end-game before now, so I'm semi-new at this. Does anyone have any advice for my gearing/spec?

The World of Warcraft Armory

Once again, I only do 10 mans, and while I do PuG 25 man on occasion, it's never really past Auraiya. Conquest gear is obtainable, though.

Feel free to tell me how much of an idiot I am for gearing/spec'ing the way I do. Namely, I have way more defense than I think I should (Gonna do some re-enchanting when I get off work).