Tanking regular dungeons while leveling
I've cross-posted this on the WoW Forums, though now I don't see why I posted anything there, oh well. My question is that I'm leveling a Death Knight. He's currently level 73 and I'm really enjoying tanking regular instances with him throughout the leveling process. All my runs go very well, and for the most part no one complains. However, there have been two occasions when someone has told me that I need better gear to tank.
How much emphasis should I be putting toward gear to tank? Should I be going out of my way to get crafted gear and being fully enchanted, etc? Or should I just take what tank gear comes my way via quests and dungeons I run? Thoughts?
Of course, certain Tempered pieces are easily obtainable at L74, 75 etc which I'll get as soon as I can wear them. But other than those, how much should I be worrying about gear for regular instances?
Here's my Death Knight's armory. Any input would be helpful.