I'm currently thinking of switching from my demon hunter to my priest for my main this tier. I'm fairly good with my priest and know how to do the rotation as shadow, but I would like to know if someone knows just how much haste I need to effectively play shadow? Is there also a certain percent of crit/mastery I should be aiming for? I'm sitting at 31% haste right now, mainly because I've been holy so the majority of my gear is crit/mastery, and feel like that level of haste is way too low to play the spec well.