Anyone who complains about mana, please enchant your armor. Its not hard, you don't need any perks to get huge returns, especially at low levels. I am not sure what you are doing with all your soul stones, but just a little enchanting and no more mana problems.
DO NOT ENCHANT REGEN!!!. It doesn't work in combat. So why worry about regen when your spells can be made to cost 1 mana. 1 mana isn't so bad is it.? Please enchant, it is a school of magic so your not even going outside your sphere. Feel free to pass this message on.
"Enchanting is a mages friend."
Feel free to say this to yourself, a friend, spouse, coworker, fellow gamer, and your doctor.
Spoiler Side note: You can get Zero mana cost for all schools of magic if you wish too with enchanting. I won't spoil it by telling you how but its not much harder and does require some perks
Also alchemy is a lot more friendly to mages than I thought. Mana and Fortify pots are mostly useless, but poison can open a whole can of Kick Butt. Definitely creates a play style I have never experienced before.