That's a hard question to answer for another person, and you don't really have any glaring weaknesses in your gear. What stat do you find yourself wanting to boost more atm? Haste, spellpower, mana pool? Might want to check out RAWR if there are a couple of items that appear close. If you are really in doubt increasing your lowest ilvl items can be a good place to start.
Cloak, trinket, or something to boost haste perhaps? *shrugs* That's what came to my mind at least when I looked at your armory. But like I said that's a hard question to answer for you...
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That monster in the mirror, he just might be you. -Grover