With this build you will dominate early game, mid game and late game. With all these armor penetration you will take a tank down like nothing, even when they got Thornmail. Try not to use Golden Aegis to often early game, or else you will go out of mana.

Mark: Pure Armor Penetration.

Seal: You can chose between Attack Speed, Dodge Rating, Armor or even Mana Regen. Depends on what you think is best for you.

Glyph: Here you can also chose between Attack Speed, Cooldown reduction or Mana Regen. And again depends on your play style, if you want to be very offensive at the start the Mana Regen Glyph/Seal if good.

Quintessence: Pure Armor Penetration.

Start with a Long Sword and Health Pot, then you stay in lane until you get enough coints for Last Whisper. By now you will do huge damage, but be careful since your run speed is low.