Iets wat ik mij weer herinnerde ooit gelezen te hebben.
Gevonden op de U.S Priest forum.
For casters, the choice is always: Do I want more spi, int, or +heal/dmg? Many people used to think spirit was useless, tho now that we are in the high end game, I think the healers are definitely learning the value of spirit. Likewise, +healing/dmg is often overlooked as worthless, but the impact of these items can be quite big.
Spi vs int.
Many people say, int. In a way it's true, for short fights, int is much better, but in the longer fights, spirit becomes much more useful.
1 int = 15 mana
1 spi = 0.25 mana / tick
1 tick = 2 seconds
So, for 1 spirit to regen 15 mana, it takes 2 full minutes.
Of course, we're often under the 5 second rule, which means spirit isn't always working. Using a common 2 man rotation, we can say that we'll prolly be under the 5 second rule about half the time. Sure, sometimes heals overlap (for example, when you a toss a heal out of fear the tank will die), but you also have times where mana regen kicks in for a few ticks, even if it's your turn, because you don't need to heal constantly/mana conserve keeps interupting heals. Overall, I think we are actually regaining mana more often than half the time, but let's say it's half the time.
So that would mean that it takes 4 minutes to regen 15 mana from 1 spirit. So if a fight lasts longer than 4 minutes, and uses rotations (which is just about every boss fight in the high end game right now), 1 spirit is better than 1 int after 4 minutes...
Four minutes might sound like it's fairly long, but in boss fights it's nothing. Onyxia usually lasts 20-30 mins, for example. I haven't timed most boss fights, but I would guess that are around 10-15 mins in many cases.
Of course mental strenght (+10% max mana) and meditation change things a bit.
Mental strenght makes every point of int give 16.5 mana, which adds 12 more seconds to the mana regen before 1 spi = 1 int. With mental strenght, it takes 4 minutes and 24 seconds for 1 spi = 1 int (assuming half the time you are under the 5 second rule).
Likewise, meditation changes things a bit too. Since I assumed you would be under the 5 second rule half the time in this comparison, you will only get any effect from meditation half the fight. So, in 2 minutes, you have 60 ticks. So 60 * 0.25 * 0.15 (only 15% from meditation) = 2.25. Meditation adds 2.25 more mana over those 4 minutes (of which you spent half under the 5 second rule).
Comparing the two. Mental strenght gives a boost of 1.5 mana per int. Meditation gives a boost of 2.25 mana for every 4 minutes of fighting per 1 spirit. Of course, meditation is a higher tier talent, but if the choice is between mental strenght and meditation, for those boss fights, meditation is gonna be better in most cases.
Conclusion about spi vs int? Well, spi is almost always better for boss fights. There are few fights were int is actually superior (rag spam fest, since you regen little mana, and kazzak, since it ends quick). Of course you want enough int to have a good mana buffer, but other than that, spirit rocks for boss fights.
mana / 5 seconds vs spi
How do the mana / 5 seconds items compare? Well 0.625 mana / 5 seconds = 1 spirit. Which means that 3 mana / 5 seconds is about equal to 5 spirit (3 mana / 5 seconds is slightly better).
However, that is ignoring the 5 second rule again. So if we assume the 5 second rule applies half the time, it would be 3 mana / 5 seconds = ~10-11 spi.
Worth noting is that mana / 5 seconds doesn't boost innervate, so spirit has a slight edge for that, tho overall I would say mana / 5 seconds is a very nice bonus.
+healing vs int
+Healing, considered totally worthless by many. Tho often it's for a good reason, the items that carry these bonusses often have the most horrible stats ever imagined. Now bliz finally seems to be making some items with +healing and worthwhile stats too.
First off, the effect of +healing depends on the spell. Any spell with a cast time under 3 seconds is penalized. Spells of which the cast time gets reduced below 3 seconds by talents (like frost bolt) should receive full effect still (according to bliz). HoT's like renew get the full effect too, since they last 15 seconds (based on personal experience).
For this comparison, I'm only looking at flash heal, because it's by far the most common spell we cast in raids.
Flash heal heals for about 885 hp's on average, for 380 mana. That's 2.33 hp's per mana.
Flash heal only gets a 44% boost from +heal effects (according to bliz).
For these calculations, I'm going to assume you cast 20 flash heals in a fight, in most cases, it will be more than that.
1 int = 15 mana. So 1 int = 15 * 2.33 = 34.95 hp's. With 1 int, we have enough mana to heal another ~35 hp's.
For +healing effects to heal 35 hp's, with 20 flash heals we need a 35/20 = 1.75 heal boost to every flash heal cast. Considering the penalty flash gets to +healing, that means 1.75 / 0.44 = ~ 4. So, and I found this very surprising, a mere +4 to healing is actually equal to 1 int in terms of healing.
Now, doing the same calculations, but including heal crit chances and holy talents, which I feel is a more fair way of comparing it (note this assumes none of the heal crits are overhealed).
I took an average of 10% crit chance. That's not that high, but I don't think most priests go for spell crits. Spell crits aren't that great at boosting your healing. Crits are unreliable, can overheal often, and +healing is almost always superior for increased mana efficiency.
Flash heal average: 885 * 1.1 (spiritual healing) * 1.05 (10% heal crit chance for 50% more healing) = 1022. 1022 / 380 = ~2.7 hp's per point of mana.
15 * 2.7 = ~40
40/20 = 2
2/0.44 = ~4.5
Realistically, about +4-5 healing is equal to 1 int, assuming 20 flash heals are cast during the course of the fight.
I found that quite surprising. Now obviously you need enough int still. If you have virtually no mana, all the +heal in the world won't do any good, because you can only cast like 5 heals before running out of mana, so you need a good balance. However, I feel I seriously undervalued +healing, and how it compares to more int.
My conclusion
I feel I didn't give spirit and +healing as much credit as it deserves. Obviously I'm not going to ditch all my int gear for spi and +healing, but I definitely think I should get more spi and +healing gear. 1 int isn't anywhere near as good as I thought it was, and in most cases, 1 spi and even a weak +4 healing are superior.
Also worth noting is that both spirit and +healing have other bonusses related to them. Spirit also increases the mana recovered from innervate, which is great. +Healing quite simply improves mana efficiency. I compared it simply to 1 int in terms of the amount of mana gained from 1 int vs the amount of mana saved from +healing's mana effiency. However, if you consider mana from other sources, such as natural mana regen (spirit), innervate, mana consumables, etc, you realize that, unlike int, +healing also makes all that extra "outside" mana much better. The more heal spells we cast during a fight, the bigger the difference becomes.
Recap
* 1 spirit is better than 1 int after 4 minutes, if you're under the 5 second rule about half the time.
* 3 mana / 5 seconds = ~10-11 spi, if you're under the 5 second rule about half the time
* About +4-5 healing is equal to 1 int, assuming 20 flash heals are cast during the course of the fight