I would do BoRK instead of Zephyr.
Since most people generally go for warmogs as their tankyness it's a good counter to it.
It is also get a buff in the next few patches so this item will be in play a lot.
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wtf is BoRK, and by the way, the defensive item(qss/warmogs/guardian angel) is entirely dependant on the enemy team composition
Blade of the Ruined King.
+40 Attack Damage
+10% Life Steal
It's unique passive is that basic attacks deal 4% of the target's current Health in bonus physical damage (max 120 vs. minions) and heals for half that amount on hit
while the unique active deals 150 (+50% of Attack Damage) physical damage to target champion, heals for the same amount, and steals 30% of the target's Movement Speed for 2 seconds (60 second cooldown)
Tell me from all these guides, where do you see that BoRK :
http://www.solomid.net/guides.php?g=...es-build-guide
http://www.solomid.net/guides.php?g=...us-build-guide
http://www.solomid.net/guides.php?g=...ne-build-guide - Only in this guide
http://www.solomid.net/guides.php?g=...al-build-guide
http://www.solomid.net/guides.php?g=...he-build-guide
http://www.solomid.net/guides.php?g=...yn-build-guide
Most of them are going for GA/Warmog.
BoRK is useless for AD. Better buy Bloodthirster
BoRK can be used on builds where you tend to go more tanky and attack speed, a friend of mine does it often on kog and he completely dominates. its especially good against tanky teams