Post by cawfee
Priests are one of the few classes that actually benefit mostly from a single tree, so spreading out your points too much is going to hurt your overall efficiency. Short of PvP, you won't be doing a lot of good mixing Disc and Holy talents like that; Disc focuses on damage mitigation, Holy on damage recovery, so you have a build that does a little bit of each but doesn't excel at anything.
At your current level (62), I recommend this for healing instances (but I'm partial to Disc so Holy would also work):
http://www.wowhead.com/?talent#bVcbuhhVRhsrfRt(get the Rapture point filled at 63, then go over to
Imp. Renew)
... and this for an effective and mana-efficient Shadow spec:
http://www.wowhead.com/?talent#bZZhxfVofzfbqfzAoYou will definitely want Improved Shadowform to minimize pushback loss; once you have Vampiric Embrace, use it as an opener after Vampiric Touch and you can drop the Shield entirely by just VE-healing yourself through any damage done. Dispersion is a great talent on a short CD that will help you keep your Mana available in the field without having to take long breaks (
Glyph for it if you find yourself relying on it a bunch). Rotate it with the Shadowfiend and you should be golden.
Update:You mentioned something about a Smite build; I assumed you wanted to use the first one for actual healing. If not, disregard my first talent tree since it's pretty much for healing only, not leveling / grinding.