Just a few tips.
If extra gold start, relic, 2 ward, red trink. otherwise relic, 1 ward, potions, yellow trink.
If you don't have any wards, in the river or in your inventory, tell adc to be careful, go back once you know the jungler's not coming down.
If you can afford sightstone, buy it. If not, make sure you have at least two stealth wards, you can trade yellow for red. If lane's not looking good, buy targon's, if it is, ruby crystal to go towards your sightstone.
Once you have sightstone, targon's is optional, boots are optional, rush randuin's omen.
This gives Taric the power of the gods the ability to towerdive once obtained. He gets more armor from armor. Gets more damage from armor. Gives more armor from armor. Heals more with more health. Randuin's Omen is a must with this much synergy.
Next you should work on either boots of your choice (I prefer swiftness, DO NOT RUSH ENCHANT), or work on face of the mountain.
At any point in these times, if you have a spare 100 do not fear buying vision wards. A good place for one is the bush directly north of the dragon pit, or if you're on purple side, the bush to the right of their wraiths, especially if they have a stealth jungler.
From there on, it's really your choice. I don't really like the new support item, and don't think it would work well on Taric unless you have Locket. A single target heal and a single target shield you'll use on yourself half the time wont allow you to benefit from the only somewhat useful part of the item.
Some items I like are Spirit Visage, Banshee's Veil, Guardian Angel, Sunfire Cape (vs heavy AD teams), and Ruby Sightstone/upgraded red trink (if you find vision to be a major struggle, or you have nothing else to upgrade)
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