So I did some parsing last night with a test necro while the server was locked.
Necromancer_ftw
-5.5k mana pool
-12FT
-all relics
-raid buffs
-afflication 4
-150AAs
-1 mod rod
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Test 1
This combination is for your conservative necro who wants to do remarkable sustained dps, and not lose too much mana.
USING:
Marlow's Cremation + Scitterpox only
I did these two spells constantly for 7 minutes and then I said "Screw it, it's been 7 minutes, and I've been doing this non-stop and I'm still at 75% mana!"
So, you can keep these two spells up for quite a long time!
7 minutes you lose 25% mana, you can keep this going for at least 20 minutes (I said 20 even though the math shows 28 minutes) at 160dps - NOT INCLUDING YOUR PET
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Test 2
This selection of spells is for your greedy necro who wants to burn his mana and kill the mob as fast as he/she can!
USING:
Scitterpox, Marlow's Cremation, Caress of Sivyana
It took me 6 minutes to get OOM, and the whole time I did a total of 200DPS with spells. PET NOT INCLUDED
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The following above two tests did not include pets, nor did it include necro damage clicky AAs either. It did include resists. And opps, I forgot to malo/resist debuff the mob too! For the necros who think stacking 200 dots on the mob is your best dps, think again. The health HoT/DoT, pet DoT/HoT and snare DoTs are horrible for mana vs damage and are meant for grouping/soloing situations, not raid situations.
The more you know...