Your gear looks pretty good like you said, hero's and rep rewards. I would say get the BoE shoulders that drop in CoT Strat and your ready for 10 and 25 mans.
As far as upgrades go.
Stam = Def = Dodge > Exp/Hit > Str >>>>> Parry (IE, never look for parry, ever. If it comes on a gear slot, great, if it doesnt great)
Your spec is a bit wonky, Descration is crap if your not putting 5/5 in it and its still crap then because you should be using the glyph of SS which means your barely ever PS. Also, no morbity or reaping??? Death runes = more SS = more threat.
you can check my Armory for the a spec that is focused on threat/DPS. Ignore the ghoul talents as I was speced for an 8 man naxx run and trying to squeeze out more DPS. Until the patch, ghouls just fail at raiding.
I cast the spells that make the people fall over.