This sort of request for personal gear advice is against our rules here. However this rule (and only this rule) is relaxed in the "simple questions" thread. I'll move this post to that thread for you; next time make sure to ask in the right place.
(To answer your question, the best way to find stat weights to plug into Mr. Robot, Lootrank, or other sites is to generate them for your own gear and talent setup. Download the latest version of simulationcraft, import your character, bump "iterations" up to at least 10000 in the options tab, check all the melee dps stats in the "scaling" tab, and click simulate. If you don't increase threads it will take a while. Once it's finished you'll have the best answer available for your question, and you'll have the power to answer similar questions in the future.)
I have been checking things here out for a while now and appreciate a place that i can get Unholy DK info from. This is my first post so hopefully this isnt entirely a stupid question. I currently have 4pc T13(non-heroic),Visage Helm and Regular Gurthalak. My question regards the stat of Mastery being more important than Crit with this setup,seems like live hit a cap as i cannot get over 2373 haste. Is this something i should worry about or is it just the limitations of the current gear I have? I think my DPS isnt bad but if there is room for improvement i am open for suggestions.