Right now, no, there are not really any fights that require a huge health pool (unless you are trying to do something crazy like "I'm on a boat"). I am sure that will change in the future in some other parts of ICC and especially once we get into the hard modes.
Looking at the armory, you don't have any big pressing needs, but I would not bother getting the T10 set pieces until you know are going to get the mark to upgrade them from 25 man Saurfang.
The trinket is a good choice because it is something you are probably going to keep through the rest of the expansion for your EH set and there are not real loot drop alternatives. You can look at the loot lists from the rest of the raid zone though and compare the other emblem loot to see what you are less likely to replace from drops.