Post by Naif
Go with high stam and migration gear for 25 man and blockrating blockvalue gear for easier trash/5 mans, heroics etc.
The new expertise skill is doing alot for threath generation if you are starving for that.
I have like 3 diffrent set of gear when tanking:
1) Max stam & migration for the tough instances.
2) Blockvalue, block rating and aviodance for the easy instances
3) Blockvalue & hitrating and expertise for solo and questing etc. 700 BV + trinket is alot of dmg :)
Since
www.tankspot.com is blocked by work i cant give more spesific answers but check that site out, all you can ever read about tanks on one site.
My spec is
http://www.wowhead.com/?talent=Li0czZVZdEtoI0zcxst And that one works like a charm whatever i do :) (imp defencive stance is good tho on hydross etc)