I didnt find any threads about this, so im just curious. atm im running 4 set 251 t10 ( shoulder, gloves, chest, legs) and today in a icc 25 pug i was lucky enough to get the Mark Of Sactification.
So my question is, wich of the parts should i upgrade first?
Basically you want to upgrade the item that will give you the most. If you don't need that little more hit or expertise from your gloves/legs, as I can see that you don't, it'd be best to upgrade either your chest or shoulders. It doesn't matter which one as they both get the same amount of stat upgrade compared to their 251 counter-parts.
I went for gloves and shoulders first because at the time it made sence as far as itemization and was the fastest way to the t10 2 set bonus. That was before they released The BIS model with Tiny Abom in a Jar, wich has 85 hit rating. Just here to say buying gloves will end up being a waist of 60 badges.