Off the top of my head If you havent done and vendored the rewards
- the forge camp quest chain in western nagrand (starts, I think, by the man by the drake) gives a nice blue defense chest (if my memory serves me).
- the windtraders band, from a quest in blades edge
Also, I'd work towards the legs from Keepers of Time rep and definitely a better trinket which you sound like you have a plan for getting.
As for what you can and cant tank, you should be fine (with a good healer and group) for all normal dungeons and the easy heroics - mech, sp, ub, ramps. You'll need cc though, so chose your groups wisely. 11k hp and 11k armour was always the default minimums for starting kara, with ofc crit immunity.