Ignore the stuff Jendah said, he's simply clueless.
The BiS list is the following:
Head:
http://wotlk.openwow.com/item=51247
Neck:
http://wotlk.openwow.com/item=50700
Shoulders:
http://wotlk.openwow.com/item=51245
Cloak:
http://wotlk.openwow.com/item=54583pico park
Chest:
http://wotlk.openwow.com/item=51249
Bracers:
http://wotlk.openwow.com/item=54584
Gloves:
http://wotlk.openwow.com/item=54560
Waist:
http://wotlk.openwow.com/item=54587
Legs:
http://wotlk.openwow.com/item=51246
Boots:
http://wotlk.openwow.com/item=50699
Rings:
http://wotlk.openwow.com/item=50664 and
http://wotlk.openwow.com/item=50400
Trinkets:
http://wotlk.openwow.com/item=47059 and
http://wotlk.openwow.com/item=54589
Weapon:
http://wotlk.openwow.com/item=50734
Shield:
http://wotlk.openwow.com/item=50616
Relic:
http://wotlk.openwow.com/item=50464
Gem spellpower and haste. The meta gem is:
http://wotlk.openwow.com/item=41401
Enchants:
Get spellpower crit on both head and shoulders, haste on cloak, 10 mp5 on chest, spellpower on bracers and gloves, eternal belt buckle on waist, spellpower stamina on legs, tuskarr's vitality on boots, spellpower on weapon and intellect on shield.
Glyphs:
Major: Glyph of Chain Heal, Glyph of Healing Wave and Glyph of Earthliving Weapon.
Minor: Glyph of Water Shield.
Some people would argue that the neck Blood Queen's Crimson Choker is better than Holiday's Grace, but it's not cause the haste on BQL neck is terrible compared to the mp5 on Holiday's. (Once you reach 1200+ haste it doesn't scale as well)
As for the gloves the ones I linked are ilvl 271, but they're better cause of the crit. Unclean Surgical Gloves are NOT BiS.
After getting around 1200-1300 haste, crit is what you want next (notice how every piece except for the ICC ring in the actual BiS gear list gives crit).
The mp5 you get from neck, legs, trinket and the ICC ring is enough mp5. The reason why it's enough mp5 (only around 600-650 fully raid buffed WITH Solace stacked up) is because of the talent Improved Water Shield. This talent is one of the reasons crit is your main stat after getting 1200-1300 haste. The other reasons as to why crit is your main stat is because of your t10 4 piece set bonus, Ancestral Healing, Ancestral Awakening and untop of that critting is fun. With BiS gear you're almost at 55% crit fully buffed, which means that you'll never oom during any fight(crit = mp5 cause of the talent Improved Water Shield) unless you'd for some reason spam healing wave for 2 minutes or something lol. People will probably disagree with the neck, gloves and the ring because, you know... THERE'S ITEMS WITH HIGHER ITEM LEVEL, THEREFORE THEY'RE BETTER. I've been maining rsham for 8 years, and I wouldn't bother writing all this **** unless I knew that I was right. The BiS list above is in fact the list you want in order to do max healing. If you have any further questions feel free to ask them here or ingame by sending a mail to Stormtide on Deathwing.
Stormtide