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Get Surge of Light if you do not have it for increased dps... this will allow you to get a free smite every mob or so. With the new mana regen tied into intellect it makes the need for Spirit Tap less of a concern once you hit level 70.
Although SoL is definitely a great talent, I'm wondering how you can have a free smite every mob or so. SoL gives you a 50% chance to get a free Smite for every crit you do. Quick calculation here, with 20% crit it means 10% chance to have a free Smite. All in all you need about 10 DD casts to get a free Smite, less if you have higher crit%, more if you have lower crit%. It's more like every 2-3 mobs if you cast 4 DD spell per mob like in your spell rotation.
In short SoL will boost your dps a bit but it will also improve your dpm. The more crit% you have, the better it is.