I don't arena with mine. I got my palies +def to 495 and needed other avoidance stats as well as more armor and HPs.. so I'm using the merc chest.. it has way more stam and armor than any of the non-raid chests I could get. So I gemmed it up to add more avoidance.

As a side note. In WotLK ill probably tank as ret. Bliz has stated that any of the tank class specs( warriors+fury or arms..any DK tree..ret..ect) will be able to tank non heroic instances fine. In fact they have even said that Hunters pets ( Bm spec with tank type pet and pet talents) Could tank non heroics. For Heroics you will need to be tank speced and equipped. But for leveling.. Ret will be way more fun! That being said. I'm saving my points, IF bliz announces a "reset" of honor points before WotLK goes live. ill spend all the points on ret gear. IF not Ill save it for level 80.