Pardon the fact that this post is gonna blow some poor 17" away
I took the liberty to run let emberstorm run through my calculation bot.
Setup: 21/40 SB vs 21/40 Incinerate
SB with ISB, no cataclysm
Incinerate with cacatlysm
All possible raid buffs + t64part
10000 base mana
360 seconds duration
1000 cycles(to get average DPS)
Warlock is getting all his ISB for himself(granted he hits)
Immolate is up the whole time(from another warlock, NOT self cast)
Y-axis is DPS, X-axis is spelldamge scaling from 0-1800
(Yes for the theorycrafters, for each point in spelldamage it does 1000 cycles of 360 seconds)
I don´t dare to say that my calculation is 100% flawless, but it looks very close to reality.
Picture 1:
202hit, 0 crit, 0 haste, OLD emberstorm
http://img244.imageshack.us/img244/6421/warlock1pl8.jpg
Picture 2:
202hit, 600 crit, 0 haste, OLD emberstorm
http://img341.imageshack.us/img341/6317/warlock2md4.jpg
Picture 3:
202 hit, 0 crit, 300 haste, OLD emberstorm
http://img184.imageshack.us/img184/2710/warlock3dn7.jpg
Picture 4:
202 hit, 600 crit, 300 haste, OLD emberstorm
http://img185.imageshack.us/img185/2831/warlock4vv2.jpg
Picture 5:
202hit, 0 crit, 0 haste, NEW emberstorm
http://img337.imageshack.us/img337/2982/warlock5fc2.jpg
Picture 6:
202hit, 600 crit, 0 haste, NEW emberstorm
http://img404.imageshack.us/img404/2038/warlock6cz8.jpg
Picture 7:
202 hit, 0 crit, 300 haste, NEW emberstorm
http://img187.imageshack.us/img187/9357/warlock7id9.jpg
Picture 8:
202 hit, 600 crit, 300 haste, NEW emberstorm
http://img509.imageshack.us/img509/3569/warlock8aj3.jpg
Picture 9:
202 hit, 600 crit, 300 haste, NEW emberstorm, NO mana used
http://img213.imageshack.us/img213/9166/warlock9wb6.jpg
Picture 10:
202 hit, 600 crit, 300 haste, NEW emberstorm, SB without ISB
http://img213.imageshack.us/img213/6...rlock10zc0.jpg
I´ll check for errors and see if I can tune the Mp5 into it next, or the Life Tap changes.
Conclusion?
From what the calculations give away it doesn´t seem to matter much whether you use SB or IC in endgame.
ISB is what pushes SB slightly ahead(mind a calculation with cataclysm might change values a little).
Both scale equally with haste, SB scales better with crit(what a surprise).
The margin that keeps SB ahead seems to be ISB - but this calculation is not done with shadowpriests and other warlocks in mind.
Note: Compare #8 and #10 and you will see that ISB accounts for roughly 400 DPS at 1800 spelldam.
Feedback is welcome
#Edit - pictures removed for new calculations