Philostone + Kindlegem. Hold onto these two items until late game, don't rush to turn it into reverie- milk the gold/10 for as long as needed.
Boots of Lucidity to get your CDs down to a decent %. You should have approximately 25-35% depending on masteries, no need to cap it out at 40%.
You may also invest in a heart of gold or another philostone for more g/10. Generally, if you can get two g/10 items within 10 minutes- do it, otherwise it's not really worth the investment.
Otherwise, build to counter whoevers getting fed on the enemy team. Alistar doesn't need to build full tank. I personally like getting Stark's Fervor on him.
XI Wiki


