You could purchase the Spec-ops Body Armor at the BoO Special Equipment vendor. It has Reckless as it's Talent, a 1512 armor rating, and +615 Stamina rating. That's where I would start but it is a hefty 546 PC. Then recalibrate the Health on Kill or Protection from Elites attribute to a mod slot. Which leads me to mod slots, try to get as many as possible and use Stamina/Armor or Stamina/Skill Power mods in said slots. I'm currently using three Sentry's pieces for the extra Headshot and Elite damage. Outside of that look for high armor gear, +ammo capacity gear, +critical hit chance, +critical hit damage, and just be smart about recalibration and give it a lot of thought before making a decision. The BoO vendor is usually selling something worthwhile each week that you may have to recalibrate but will improve an important stat by a large amount.
This is all without knowing what play-style you are looking for. Run tons of CM missions and HVT, etc.
