2x Circle of Healing - Can't play without circle in control priest. Combos with Auchenai as removal, Northshire for card draw, Blademaster for a sticky body, it's just too damn good.
2x Flash Heal - This is a rather abrupt meta choice due to the prevalence of Reno Lock and Aggro Shaman. While it doesn't put boots on the ground like Naaru, it heals for 2 more and is a better nuke when combined with Auchenai. Auchenai + flash heals is your win condition against Jaraxxus.
2x Power Word Shield - enable better trades for your creatures and dig through your deck
2x Northshire Cleric - Terrible against other slow decks but mandatory for midrange and aggro
2x Zombie Chow - Ordinarily a personal preference card, I think it's mandatory atm due to the need to contest the board starting at turn 1, and it potentially combos with Auchenai
1x Shrinkmeister - Mainly to combo with a Cabal, occasionally used as a tempo drop or a proactive 2 point heal when trading.
2x Wild Pyromancer - Ordinarily a personal preference card, in the current meta it potentially gets you way too much value not to run
2x Deathlord - Ordinarily a personal preference card, this has too fat of an ass not to run in this meta
1x Shadow Word Death - This core configuration assumes you're running 2x entomb, in which case you want 1x Death, 1x Nova, and 2x Lightbomb.
2x Auchenai Soul Priest - Doesn't need an explanation.
1x Holy Nova - See Shadow Word Death
2x Entomb - These may be too slow, but they're the ultimate silver bullet. They take care of troublesome deathrattles, things priest ordinarily can't deal with like Ysera, and plays around Avenge, Anyfin, Duplicate, etc.
2x Lightbomb - See Shadow Word Death
2x Cabal Shadow Priest - Too much value not to run. The Shrinkmeister may eventually be phased out, but Cabals are too good.
1x Justicar Trueheart - This makes your taunts much harder to bash through over multiple turns and keeps you ahead of topdecks if you manage to drag the game out against fast aggro. Also gives you more reach with Auchenai.