I'm a little fuzzy with how effective armor pen is in comparison to other stats. When comparing Dory's Embrace to Drape of the Dark Reavers, Dory's results in:
+112 Armor Pen
For a fury DPS warrior with a solid hit rating, it would seem more beneficial to use Dory's. However, to me specifically, I haven't had an opportunity to pick up a lot of hit gear so I'm around 132, and my raiding situation relates primarily to ZA, Hyjal, and Black Temple. Would you recommend continuing to stack hit until using armor pen and to treat it primarily as a luxury? Or would you actually replace Drape with Dory's?
I would use the drape for now but buy dory's. Unless you are incredibly unlucky in BT/Hyjal your hit rating should be about to skyrocket. Your best cloak will be the one from gorefiend but Dory's is the next best and useful to use untill you can get Gorefiend's.