So, after buying/farming for my gear, my tank is -almost- finished. I still have to farm up CP, work on getting some undaunted traits, etc. But, she is doing very well and after 3 dungeons and a bunch of world bosses, I feel comfortable with my magicka based tank. She does very well and has really good stats as a tank.

She is currently wearing: 5x Plague Doctor's; 5x Warrior-Poet's; 1x Mephala's helm (just for the 1024 health)
Her stats are as follows:
Health: 42943
Magicka: 22380
Stamina: 14486
Spell Resistance: 33361
Physical Resistance: 32283

#3 on bar 1... it varies between inner rage and enchanted growth depending upon whether you're playing solo or in a group content.

Also, the bear will be used in your ultimate slot when solo'ing, as it adds some extra DPS, which is very useful.