Swiftness Boots
Swifties is great, as usual. I think it's a nice option vs ranged in general.
Heartsteel
Heartsteel for sure if he's going a squishy build, but probably good in general.
Iceborn Gauntlet
Iceborn Gauntlet for the slow is nice if he doesn't have Phase Rush to basically ignore it. I think health stacking or AP is probably fine too though, such as Warmog's or Riftmaker.