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The ideal armour for sin is the BB gear, with that your pure dps will not be higher until t4, and even then the increase is very negligible. If you have the time and the effort, get the SC set afterwards, since the prot is very useful in some t5/t6 instances, along with some dungeons.. If you cant be bothered, then with just the BB set you're ready for most things :)
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Brittle Blade is tons of dps at the cost of LITTLE to NO hate decrease and low health.
T4 doesn't really add too much more dps, it adds armor, health, hate decrease.
Secret doors set is great for protection..with some feat tweaks and full set secret doors you can easily get 55%+ prot.
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I assume the OP has found his way by now, but anyway, Brittle Blade is the only really useful PvE set from Khitai, anything else is grasping at straws. Scarlet Circle set is good for nothing but a niche protection tanking set, if you just want general prot to survive stuff use your brain with your spec and get things like Lotus Tainted Blood, Lotus Overload (which does proc from heals) and Dull Pain. Buff your con through accessories, not your armor (death's ward/coil of the jiang shi rings have tons of it). Get the T3 helm, shoulders for a bit of hate decrease and the amra's pride and you're done pre-T4.