It's previously been stated that a priest can effectively sustain DPS with lower ranks of spells.
It's also been said that a priest can effectively sustain DPS with high mana per 5s gear.
Consequently, it's quite hard to build up an optimal gearset for priests
i.e. you could use Shimmering Geta, Essence Gatherer and Lok'amir il Romathis/Royal Scepter of Vek'lor [+104 damage, 17 mana tick and 1% hit] or alternatively Snowblind Shoes, Jin'do's Judgement, and Wand of Qiraji Nobility [+78 damage, 19 mana tick and 2% spellhit].
There's lots of combinations. I'm not a DPS priest but some people are - just for the sake of it, I was interested in which approach works better in terms of raid DPS. Downranking or regen.
I made 2 gear sets - 1 which concentrated on getting high +dmg with some spell hit and 1 which concentrated on getting high +dmg with regen. View at
http://ctprofiles.net/1066304 - (yes, these gear sets are probably unrealistic for most priests).
All I was interested in was how long a priest could maintain an "acceptable" level of raid DPS (which I've set at 350 DPS, based on lock/hunter damage in recent meters). First thing I had to do was determine how much regen whilst casting each gearset got with standard/cheap Alliance raid/food buffs (BoW, MoTW, DS, Kings, Sagefish Delight).
People CAN use MMPs and Flasks on special fights but we're probably talking about farm content here so assume people are being lazy. I also had to find how much mana (Arcane Int) and how much +dmg (Arcane Elixir, Brilliant Mana Oil) each had.
Damage set:
Regen whilst casting: 85.9 mana/5
mana pool: 7360 mana
+dmg: 727
spell hit: 8% spell hit
Holy damage crit: 21.1%
Regen set:
Regen whilst casting: 155 mana/5
mana pool: 8062 mana
+dmg: 526
spell hit: 6%
Holy damage crit: 17.7%
The next thing that I had to do was determine how much damage (on average) they would do with various ranks of Smite (2s cast). They'd probably get better damage/mana with Holy Fire but I sort of forgot about that. I haven't factored in crit (150% damage) nor spellmiss' vs lvl 63 mobs nor the approx 5% "resistance" that lvl 63 mobs have.
Damage set:
Smite (rank 4) - 95 mana - 709 damage
Smite (rank 5) - 140 mana - 781 damage
Smite (rank 8) - 280 mana - 1049 damage
Regen set:
Smite (rank 4) - 95 mana - 544 damage
Smite (rank 5) - 140 mana - 616 damage
Smite (rank 8) - 280 mana - 884 damage
Assuming Judgement of Wisdom on the target and treating it like a 29.5 mana spell reduction (50% chance to proc 59 mana), how long would each priest last chain spamming each spell?
Damage set:
Smite (rank 4) - 7.8 mins
Smite (rank 5) - 3.2 mins
Smite (rank 8) - 1.1 mins
Regen set:
Smite (rank 4) - 82 mins(!)
Smite (rank 5) - 5.5 mins
Smite (rank 8) - 1.4 mins
What is the point of all this? Well, for one, gearing for regeneration at the expense of +dmg for priest DPS is probably bullshit or at least not as important as it is sometimes considered. There's nowhere NEAR enough of it in game (ungimped) to allow a priest to last as long as a mage/lock. Downranking spells will see you lasting many times longer without even looking for regen because there are literally no ways of replicating the absurd efficiency of these spells.