Pre-ZA the helm was clearly the best thing out there pre-t6, and the only reason I didn't take Engineering was because I'm lazy and my AH is useless so I would have had to personally farm most of the mats to get 'er done.

Post-ZA, I think the Battle-Worn Tuskguard is at minimum competitive with the goggles, so if you're killing Hexlord regularly snagging Engineering is a lot less important.
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http://armory.worldofwarcraft.com/#character-sheet.xml?r=Maiev&n=Julian