Originally Posted by Tahapenes
Not true in this case. Before accounting for buffs (Kings, Fel Armor) Bracers of Fiery Night has 19 SP on Death Surgeon's Sleeves at ilvls 284 and 277 respectively (Runed in BoFN and Purified in DSS). After you figure in the buffs, BoFN still has about an 7 to 8 SP lead on DSS. Once you include Glyph of Life Tap into the mix, the spell power difference is going to be a wash (meaning the raid is going to get at most 0.1 to 0.2 SP if you're wearing DSS over BoFN with DP proced). If you figure you have 7 DPS casters along with 5 healers, that rDPS and rHPS increase is going to be under the Warlock's pDPS by going with Bracers of Firey Night.
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[Death Surgeon's Sleeves] gives us:
68 Spi from item (Before kings)
10 Spi from gem (Before Kings)
12 Sp from gem
5 Sp from Socket bonus
110 Sp from item
3.91 sp from intellect through Demonic Knowledge (After Kings)
10.75 sp from stamina through Demonic Knowledge (After Kings)
50.62 sp from Spirit = (68+10) * 1.1 * ((0.3 * 1.3) + 0.2)
Total: 110+12+5+50.62+10.75+3.91=192.28
[Bracers of Fiery Night] gives us:
23 Sp from gem
5 Sp from Socket bonus
118 Sp from item
4.16 Sp from intellect through Demonic Knowledge (After Kings)
11.43 Sp from Stamina through Demonic Knowledge (After Kings)
Total: 118+23+5+4.16+11.43=161.59
If the only thing that mattered truely was your spellpower, then Death Surgeon's Sleeves would be best. Your personal DPS however also matters, which is why Bracers of Fiery Night are in fact best in slot.
You are however entirely missing the point of what the person above you was saying; put simple: If I were to pick up this item, or really the BiS profile; then that raid group would gain 42.93 DPS. This is a relatively small DPS gain, and it's a small gain because we trade 1 very valueable stat (spirit) for a slightly less valueable stat (haste).
Your raid will however also have many other casters, if for example an affliction lock, fire mage or shadow priest would pick this item up- they would gain more DPS than we would, and ultimately the raid would gain more DPS (seeing as, just like us- theyre also part of the raid).
In short; although picking this up is technically a DPS gain for your raid, someone else picking this item up would likely be a larger DPS gain for your raid.