EHP vs avoidance discussion should be dead already. We gear for EHP to take the hits that are NOT avoided. Our healers also follow this for healing. Healers do NOT wait for you to take a hit they just spam heals on you. It's the way things work right now.
Having said that i'd like to offer you a challenge. Gather your healers and tell them to only heal you when you need it because you are going to be gemming nothing but avoidance. If they are crazy enough to agree, go tank a a hard hitting boss like festergut in 25man. make sure that the amount that the healers healed you was as close to the amount of damage you took. Just about ANY tank here worth anything will pretty much guarantee that your survival will be in serious jeopardy.
Now if you just want to get farm bosses down faster, that i completely understandable. On tank tank swaping boss simply trade a tank for a dps. I.E. marrowgar use 2 well geared tanks gearing for EH; dreamwalker: have the dps get down the adds faster and have the rogues and hunters MD/ ToT the aboms to you.
As the above poster stated please use spell checker and proper grammer. It makes a big difference on your credibility.
In closing EHP has been proven to be the best by far.
http://www.tankspot.com/showthread.p...king-mechanics) Please read this thread.