Default to Brilliant Inferno Ruby everywhere.
However, sometimes it's worth sacrificing intellect for lesser stats. I'd recommend these guidelines. Don't forget to activate your meta with 2 yellow.
If short on haste, trade 10 int for 20 haste or better.
If good on haste and in normal mode gear, trade 10 int for 30 crit. If good on haste and in heroic gear, trade 10 int for 20 crit.
Do not trade int for mastery.
Trade 10 int for 20 spirit.
I haven't looked at gear too closely. 4Pis something I'd recommend shooting for. Provided you like haste and spirit, T12 is itemized pretty well.Slot by slot comparison (normal mode gear only for now)
First. If it drops and its an upgrade. You should take it. Int is still king and if you're in a guild, suck it up and let others take tokens for T11->T12 over your sidegrades since the priority is guild progression over your greedy butt.
It's for this reason I don't normally look too closely at BiS lists. But here we go anyways.HeadCasque of Flame
vs Immolation Headguard
No reason not to get set.NeckFiremind Pendant
vs Flowform Choker
vs Heartstone of Rhyolith
Gem socket means more int. That's our winner. Reforge mastery to spirit if short on mana.Shoulders Immolation Mantle
vs Spaulders of Manifold Eyes
No reason not to get set.CloakShroud of Endless Grief
vs Wings of Flame
vs Flowing Flamewrath Cape
Use Sinestra's cloak if you have access to it. A yellow socket is nice since it's so rare in T12. Otherwise go with rep cloak because of spirit.ChestClutch of the Firemother
vs Immolation Breastplate
Good option for haste lovers to go offset.WristBracers of Imperious Truths
vs Bracers of the Dread Hunter
Valor wrists. Unless you're trying to do 1:1:1 balance, but reforging can take care of that anyways.HandsGrips of the Raging Giant
Rhyolith vs Holy Flame Gauntlets
blacksmithing vs. Immolation Gloves
Blacksmithing gloves if possible to keep 4P. Else gloves for tier bonus.WaistBelt of the Seven Seals
That was easy.LegsLegplates of Absolute Control
vs Immolation Greaves
I'd personally aim for this to be offtier. Socket bonuses means good int.FeetEmberforged Elementium Boots
Blacksmithing vs Treads of the Penitent Man
Blacksmithing is better because of sockets, but you can't heroic versions.RingsSoothing Brimstone Circle
vs Crystal Prison Band
vs. Quicksilver Signet of the Avengers
Rep ring and Soothing brimstone circleTrinketsEye of Blazing Power
vs Jaws of Defeat
vs Fiery Quintessence
vs Rune of Zeth
vs Shard of Woe
Shard of Woe is ridiculous. 1 cast/2 seconds means 1012.5 mp5 which equal to 1607 spirit passive. That's ridiculous. The proc is good for burst, but it is another CD to juggle.
The last one I'd either go with Eye of Blazing Power or Jaws of Defeat. I'm not quite sure on some of the details for Jaws of Defeat
Cast 11: -1100
But assuming it's more like Case 2 and you get a full 10 casts off in 20 seconds, that's 6050 mana saved (closer to DL spam) or 252.08 mp5 or 400 spirit. FoL spam can make that better, but with as much Judge and WoG/LoD usage we have, this may be better reserved for other healers.
Also don't know the proc rate on Eye of Blazing Power.RelicSoulflame Vial
vs. Singed Plume of Aviana
Singed Plume of AvianaShieldGoblet of Anger
vs. Ward of the Red Widow
Use the shield.WeaponEye of Purification
vs. Ko'gun, Hammer of the Firelord