I'm almost up to 60 frosts again, and I've been deciding between the trinket and the gloves. I was thinking the chest as well but I'm not sure if thats worth 95 frosts atm (though it is very very good).
I'm leaning towards the gloves because just as a straight upgrade, its the best per frost emblem. However a few of the dk tanks I regularly look at have gone for the set pieces for shoulder and gloves to begin with, so that made me rethink my initial idea.
I guess the trinket is BiS (or close to it) in terms of EH, and is a solid upgrade over mine, but the gloves give almost the same stam and a lot more armour. I thought the t10 set bonuses weren't worth the loss in stats.
If you are using those 2 DPS trinkets to tank with, then yes, the trinket is the best EH upgrade. That's obvious. If you put tanking trinkets in there, however. I might change my story a little. What do you have in terms of stamina or armor trinkets?