Just make a pug for TK, and avertise the ashes of al'ar.
@Firebyrd
I was running on some old information, I searched Resiliance up and found the error in my assumption and deleted my post, I guess not fast enough!
How to get in?
Get to the back of the building, walk into that corner you see, fall through it (don't be a draenei) fall on the smiley and walk through the portal from it's backside
for everyone mentioning Kara...
STOP MENTIONING KARA!!!
Thats tier 4. we are talking about tier 5.
This should help:
Head - Helm of the Vanquished Hero - Lady Vashj - Serpentshrine Cavern
Hands - Gloves of the Vanquished Hero - Leotheras the Blind - Serpentshrine Cavern
Legs - Leggings of the Vanquished Hero - Fathom-Lord Karathress - Serpentshrine Cavern
Shoulders - Pauldrons of the Vanquished Hero - Void Reaver - Eye (Tempest Keep)
Chest - Chestguard of the Vanquished Hero - Kael'thas Sunstrider - Eye (Tempest Keep)
(2) Set: Causes your pet to be healed for 15% of the damage you deal.
(4) Set: Your Steady Shot ability has 5% increased critical strike chance.
We're talking the 2 set bonus as well, not the 4.
To answer the question, void reaver is by far the easiest of the five and can be two manned. After that, it depends on what you want to clear, but it shouldn't be hard to find a kael pug from time to time (that's how I got the chest).