Give AP some Love too

Just my suggestions for defensive/offensive items for AP champs

Devil's Bargain The AP GA

Needlessly Large Rod + Cloth armor + Stop Watch

40 Armor 60 AP Unique Passive - GA Passive

Tome of Fortitude AP Maw

Fiendish Codex + Seeker's Armguard

55 AP 40 Armor 10% Unique CDR Unique Passive - after taking (X) physical damage gain a physical shield scaling with (X%) AP and 5% Spell Vamp

Somnus Pendant A defensive AP Sheen Item

Sheen + Glacial Shroud + Seeker's Armguard

50 Armor 500 mana 55 AP 20% CDR Unique Passive - Sheen proc - like IBG but the proc damage is based on AP instead of AD and instead of a slow zone with radius scaling with Armor it's a Silence with duration scaling with Armor

Rune Gorge The only somewhat unique item on this list

Zeal + Recurve Bow + Needlessly Large rod

20% Crit 60 AP 40% Attack Speed Ranged only Unique Passive - Every 3rd AA scales off AP instead of AD and steals (X) Armor for 4 seconds, Crits steal double the armor