Most Efficient Magic combo for N/ME

Currently i'm planning on maxing out blood/death/domination.

Boy, mana is the biggest problem but i don't wnt to invest in soul reeping since i need it for other more important attributes.

Any suggestions ?

put some into soul...
i;m currently lvl 20 and necro/memser is not that great, and there is a quest where u can change the ur second class.
i want to go N/Monk
for dark aura, dark pack, touch of agony, blood renowol combo

try shame... it is domination skill + it steal energy.

My best advice... go study the skill list.