Now a days some tanks will say go for avoidance someothers like me will tell you to get EH, It's up to you, from personal experience i would suggest EH all the way, for ToC 25 and ToGC 25 or Ony 25 EH is much much more needed than avoidance. I would suggest that you get the ring first then the t9 Shoulders (maybe you get a trophy later

). Thats because your shoulders aren't that bad, your crafted ring is really outdated.
By the way change that horrible enchant on you shoulders... get the PvP one... just like 5k or 10k honor i don't remember well gives you +30 sta and 15 res.
And ya hades is right get kolthiras cause your hit its los so losing more hit will result in a huge TPS drop.