The gem knight does these things. With IBG proc you should get double stack of black cleaver, time your spells right and you should get 4 BC stacks after 2 spell/attack combos. With the IBG slow you should be getting autos in to get your Wit's stacks, and this makes your target vulnerable to your spells. Max CDR means you can spam/auto to keep cooldowns as low as possible.

If you get into late game with guinsoo, the wits end and guinsoo synergize to give you -30 MR and -30% armor on the man you focus. This is good on tanks and lifesteal/regen champs. This is on top of the -25 armor + some that comes from the W. Stun them to stop their lifesteal and they will drop like small children.

The advantage here, is being Taric, it is unlikely that you will be focused. This gives you time to rock them with your danger mode.

If running top. You can take thunderlords (if it is still stupid OP); and Dangerous Game over Bandit. You can also take Assassin, over biscuits. You can take executioner, but more mana means more harass and heals, without mana you are done.

I run Scaling Armor and MR; this is because my games tend to last long, and given that you get past level 6 or something these amount to more substantial gains in the long run.

Attack speed cause this build is all about getting those auto's in on the target.

Flat armor quint; Scaling armor is garbage, it has 150% yeild compared to 300% yield of the yellow/blue scaling.

Nothing is less intimidating than pink taric, so take this skin, and do your dirty deeds without being focused.

Skills
If you are losing trades, put a point or two in heal, it helps a lot. (This is also good for support).

If you don't make an impact, or get bursted easily by AD, put some points in W.

E is just because the nuke level.

I don't play much Top, so these are rough ball parks on Vs. Champs.

Strategy
Stun and Run if you don't win trades.

Glacial Shroud is legit because Taric needs quality mana, and Cooldown Reduciton is the threat when combined with passive.

Rush Furor if you lose trades to get the boost. Furor if your enemy has good escape.

If you have mana issues. Get doran's ring early so you don't get caught and ganked without mana.

Alternate spells and autos if you can. Get that passive rolling as much as possible.

Heal after trades. Use shatter on minions to reduce other cooldowns (only if you have copious mana.)

Buy pink wards. Tri-bush. Bushes by red/blue to watch it, by river above red.
Keys to success.

Don't be a scaredy cat. Know that you can heal after trades. If your opponent doesn't have good sustain/heals, this means you win trades even if you come out below them ; trade when you feel safe to get them out of lane, because you can heal up easily afterwards (especially with Rod +AP)

When you get sheen or IBG, be patient and allow the 2 sec cooldown to pass before you cast another spell if you can. This gives you basically double AD for the whole fight if you can pull this off.