Dave (Shizuru) sent me an interesting blog post regarding resilience, defense, and stamina:
Is Resilience back? (http://www.tankingtips.com/2009/06/23/is-resilience-back/)
The author argues for taking the Greater Inscription of the Gladiator (http://www.wowhead.com/?item=44957) over Greater Inscription of the Pinnacle (http://www.wowhead.com/?item=44136). The trade off is 20 Dodge and 15 Defense - but you can use Resilience with Defense to reach crit immunity. (Keep in mind, though, that Defense adds to your other Avoidance.) For that trade, you get 30 Stamina.
* Critical Hit immunity for a level 80 player against a raid boss occurs at 540 Defense and requires a defense skill of 140 (689 +def rating) from gear to achieve. The defense minimum for heroic dungeons is 535 Defense.
* Critical Hit immunity for a level 80 player against a raid boss can also be achieved by a Resilience of 5.6% and requires a resilience rating of 459.2 to achieve.
* The critical hit % reduction from Defense and Resilience % may be combined to reduce the chance of being critically hit by a raid boss by 5.6% making the player immune to critical hits.