Progressing in SSC and TK, upgrades?

hi,
my guild is progressing is SSC (2) and TK (1) at the moment, we have ZA cleared. (we 1 shoted rage whinterchill also last week)
up untill now, I did a lot of heroics and little raids, and had no problem to MT.

I twink my gear the best way I could, I found that 50% avoidance and 300 BV is enough for mana regen and threat generation. I have no problem tanking the adds at morigrim for exemple, and normaly don't go oom (well, I have to tank both romeo and juilliet in kara to have enough heal acctualy with this gear, so i downgrade normaly ).

I'm still trying to get the mgt trinket, but no luck in like 20 runs. I hate this place now.

So my question is, what can I upgrade?? I want the T5 gloves, which will give 3% more block rating, but I don't know when we are gonna down the boss.
and since I'm playing with defense and uncrush values, I don't have much space for upgrades, whithout downgrading some other items.

here is my armory
http://eu.wowarmory.com/character-sheet.xml?r=Burning%20Steppes&n=Ragingsoul
14.5k hp
21.4% dodge
17.1% parry
512 def

what can I take, to stay at about 50% avoidance, to increase my stamina, but not decrease my spell dmg or threat?

I found out with TankadinTPS (thx a lot for this mod btw) that seal of Right. does more threat than holy shied or concerations, and even more with some expertise and hit rating (also a lot cheaper in terms of mana). my guild in impressed with the TPS I can make, making me the best tankadin in the guild, with well balanced hp, threat and avoicance stats.

I would like to take as much tanking gear as possible, but we use the EP GP system, and if I'm gonna take more loots, I will never be about to get the real upgrades I really need.

So help me please . I read for I don't know how many hours on this site or others about everything, but now I'm stuck.

ok, thx for the tip.
but what can I upgrate to tank in BT for exemple? or am I ok?

I made this thread to know what upgrates I should take to be ready for BT, since we are clearing SSC pretty fast, we are 4/6 now, only leo and lady left, but we never tryed them yet, it's for next week, gives time to people to read tactics.

Your current gear will let you aoe tank in Hyjal trash without much problem, and do the first few bosses in each T6 instance as well. I tanked Bloodboil this week and my gear is not a huge amount better than yours.

However, Shard of Contempt is not a good tanking trinket. Attack power is useless for paladin tanks - get something else.