KK. ALWAYS the early Recurve into Wit's End. Frozen Heart, Randuin's Omen, (I see a potential for Tri-force but I've never gotten it on him because of more AP scaling), Shurelya's(quite ridiculous seeing a monster running after you faster than the speed of Singed), Aegis, Guardian's Angel. Or you can build him spikes, which is mostly AP with the aforementioned Recurve bow(generally RoA, Wit's End, Lich Bane, Deathcap, Frozen Heart, boots). Oh, by the way, always have Merc Treads. It simply makes you a monster.
Other acceptable items are the main defensive ones such as thornmail, Banshee's Veil, Quicksilver Sash(which has been receiving a large burst in popularity everywhere), Warmog's, etc.