The supposed epitome of WoW healers, the a healing priest will no doubt go down the Holy and Discipline trees to maximize group healing. The build is painful to level/solo, and you'll solely be a support healer in PvP, but you should have little trouble getting an instance party. As expected, gear with stats of: Healing, Mana5, and INT/SPI are at the core of this build. Spirit, while nice for out of combat regen, does little in combat due to the nature of hard-hitting instances bosses in deep level 70 content. This makes Mana5 much more useful to sustain healing.
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Main Hand:
Shockwave Truncheon
The Ancient Scepter of Sue-Min
Lightsworn Hammer
Hammer of the Penitent
The Essence Focuser

Off Hand:
Tears of Heaven
Faol's Signet of Cleansing
Windcaller's Orb
Swamplight Lantern

-- or --

Two-Hand:
Seer's Cane
Epoch-Mender
Serpentcrest Life-Staff
Staff of the Redeemer
Staff of the Ashtongue Deathsworn

Wand:
Rejuvenating Scepter
Soul-Wand of the Aldor
Calming Spore Reed
Ogre Handler's Shooter

Helm:
Scintillating Headdress of Second Sight
Watcher's Cowl
Collar of Command
Hallowed Crown

Chest:
Primal Mooncloth Robe
Robe of Effervescent Light
Shroud of Spiritual Purity
Watcher's Tunic

Boots:
Boots of the Pious
Jeweled Boots of Sanctification
Curate's Boots
Light-Woven Slippers

Hands:
Prismatic Mittens of Mending
Hallowed Handwraps
Gloves of Penitence
Gloves of Piety

Legs:
Whitemend Pants
Hallowed Trousers
Pontifex Kilt
Pants of the Naaru

Shoulders:
Primal Mooncloth Shoulders
Vestia's Pauldrons of Inner Grace
Hallowed Pauldrons
Pauldrons of Sufferance

Waist:
Primal Mooncloth Belt
Cord of Sanctification
Lifeblood Belt
Black Belt of Knowledge

Wrists:
Bindings of the Timewalker
Bands of the Benevolent
Light Scribe Bands
Blackstrike Bracers

Back:
Light-Touched Stole of Altruism
Lifegiving Cloak
White Remedy Cape
Cloak of Scintillating Auras

Rings:
Spiritualist's Mark of the Sha'tar
Ring of Fabled Hope
Ancestral Band
Ring of Convalescence
Celestial Jewel Ring
Cosmic Lifeband

Neck:
Karja's Medallion
Natasha's Guardian Cord
Necklace of Resplendent Hope
Swampstone Necklace

Trinkets:
Scarab of the Infinite Cycle
Bangle of Endless Blessings
Warp-Scarab Brooch
Scryer's Bloodgem
Lower City Prayerbook