Taken straight from WoW Wiki:
Quote:
With the level cap increased to level 70 with the Burning Crusade, 350 becomes the new "base" defense value. Assuming that the raid encounters will reach level 73 mobs the new ideal level of defense will be simply 490, 50 more than the last (125 def is needed to negate the base 5% crit rate, plus another 15 is needed to negate the +3 level difference). Of course with the change of Defense to a rating system warriors will notice the defense provided by level 60 gear dropping. Due to the new talent Survival of the Fittest Druids need only 65 Defense extra to negate all critical hits, in other words 365 at level 60 or 415 at level 70. Warriors and Paladin tanks are advised to continue aiming for the magical +140.
So since you have Survival of the Fittest (I'm assuming that's the one you're referring to) you only need 65 extra
Defense Skill. That's 154
Defense Rating.
Defense Skill: This is what you see when you press K and see all your professions, weapon skills, etc. In the weapon skill category, it what appears simply as "Defense". This needs to be at 415 for a Druid with SotF to be crit-immune.
Defense Rating: This is what you get on gear. Stuff with +XX Defense Rating will increase your Defense Skill. At 70, it takes 2.365385055542 Defense Rating for an increase of 1 Defense Skill. It needs to be at 154 for a Druid with SotF to give the 415 total Defense Skill.
EDIT: D'oh, forgot to comment on your numbers.
I've checked an Armory profile because I don't know the Defense panel by heart and the second one down is indeed your Defense Skill. The gear that makes it 417 should be your tanking gear as it does make you crit-immune.
I hope I didn't make this too confusing.
If anyone wants to triple-check my numbers please do.
Edited, May 9th 2007 7:59am by Selverein