Disc Priest Guide

Quite hard to find one. Best Ive found is wowinsiders (!) one: http://wow.joystiq.com/2010/12/20/spiritual-guidance-discipline-priest-101/. The table on the first page with priest spells listed in "heal per mana" and "heal per second" is fantastic

Not my list.
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Best in Slot Pre-Raid Gear Obtainable by Heroic Instances and Justice Points:

◘ Head: Mask of New Snow - 2200 JP
◘ Neck: Amulet of Tender Breath - Vortex Pinnacle (Altairus) or Celadon Pendant - 1250 JP
◘ Shoulder: Mantle of Loss - Shadowfang Keep (Lord Godfrey) or Summer Song Shoulderwraps - 1650 JP
◘ Back: Solar Wind Cloak - Halls of Origination (Rajh)
◘ Robe: Anraphet's Regalia - Halls of Origination (Anraphet) or Musk Rose Robes - 2200 JP
◘ Wrist: Crimsonborne Bracers - Grim Batol (Drahga Shadowburner)
◘ Hands: Dolomite Adorned Gloves - Stonecore (Corborus) or Gloves of Purification - 1650 JP
◘ Waist: Belt of the Falling Rain - 1650 JP
◘ Legs: Leggings of Charity - 2200 JP
◘ Boots: Hekatic Slippers - Halls of Origination (Rajh)
◘ Ring: Veneficial Band - Lost City of the Tol'vir (Augh)
◘ Ring: Kibble - Blackrock Caverns (Beauty)
◘ Trinket: Tear of Blood - Stonecore (High Priestess Azil)
◘ Trinket: Blood of Isiset - Halls of Origination (Isiset)

Optional Trinkets:

◘ Witching Hourglass - Blackrock Caverns (Ascendant Lord Obsidius)
◘ Corrupted Egg Shell - Grim Batol (Erudax)

Main Hand, Off Hand, Staves, and Wands:

◘ Main-Hand: Scepter of Power - Halls of Origination (Setesh)
◘ Off-Hand: Prophet's Scepter - Stonecore (High Priestess Azil) or Apple-Bent Bough - 950 JP
◘ Wand: Wand of Untainted Power - Grim Batol (Forgemaster Throngus)
◘ Staff: Soul Releaser - Halls of Origination (Earthrager Ptah)

This leads to following instances:

Halls Of Origination: 6 items
Stonecore: 3 items
Shadowfang Keep: 2 items
Blackrock Caverns: 2 items
Vortex Pinnacle: 1 item
Lost City of the Tol'vir: 1 item
Grim Batol: 2 items

You can see here thats its not necessary to waste your time in Throne of the Tides or the Deadmines if you are going for gearing up for raids ASAP.