At level 60 you get 10 points of mana per point of int until you reach 200 int. After that you get 5 points of mana per int until you reach 255 int.
Your maximum mana doesn't really matter that greatly, on most raids and in most groups unless I'm purposely blowing my mana just to use it up I have 80-100% mana at all times and have to actively hunt down people who aren't FM so I can twitch them. I would feel pretty confident in saying you could put 0 points into Int as an iksar, wear the best +hp item for every slot and still have plenty of mana to do everything you want to do.
Lich does use more HP then it gives you in mana, but your lifetap spells at 49+ heal enough for the amount of mana they cost to make up for it. This is on a race that doesn't have innate regeneration. I can stand while in lich mode and lifetap periodically and eventually get to the point where I'm at full mana and nearly full health. I'm a gnome.
As an iksar your lich becomes even more efficient because your HP regeneration is that much higher naturally.
__________________
Baalzy - 57 Gnocro, Baalz - 36 Ikscro, Adra - 51 Hileric, Fatbag Ofcrap - 25 halfuid
Red99
Baalz Less - Humger, Baalzy - Ikscro
If MMORPG players were around when God said, "Let there be light" they'd have called the light gay, and plunged the universe back into darkness by squatting their nutsacks over it.
Picture courtesy of azeth |