You also might check the link in my sig.
As far as reducing incoming dmg without changing your toon (however, I agree with Dreador and you should take his advise, imo) one of the most important tools us warriors have is shield block. Against a boss that hits for 20k, shield block for someone with ~2k SBV is roughly a 36% damage reduction, almost as good as shield wall when glyphed against (although shield block obviously only works for blockable physical damage). It depends a little bit on how lucky you get with critical blocks and for the time period you have shield block up the % can go up if you get lucky and dodge/parry/miss a lot, but that doesn't really have to do with shield block.
"If the world is something you accept rather than interpret, then you're susceptible to the influence of charismatic idiots." -Neil deGrasee Tyson
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