I have a Battle-Mage at the moment and I use a bow, I use heavy armour with a 350 rating 1 perk in the tree. I have 300 health and 550 Magica. I feel like I really need the enchants on armour to get my spell cost right. I would like to know how much you other mages, or any other build have in each of these three.

Stamina can be kept at 100, even on melee and archer characters due to how it is used in combat.

Raising Magicka is helpful but if you intend to use fortification Enchantments don't raise it too high as it will go to waste when you cast your spells for near nothing, or nothing at all.

Personally no matter what character type I'm playing I put the most into Health always. I've never taken Magicka over 300.

When I play a mage, about 500 magicka feels enough. I play a cloth mage who does alchemy, but no perks in enchanting or smithing.

I'll go 300 magicka and 100 health at level 21
400 magicka and 150 health at level 36
500 magicka and 200 health at level 51
500 magicka and 300 health at level 61

When I play in Master difficulty, I'll boost my health to 150 early, probably by level 10, and generally be more aggressive about getting more health.

I would say that cost reduction is the most important thing for a mage. I also like magicka regeneration. I wear master robes of destruction when I'm in destruction mage mode.

When I play a mage, most of the time I play as destruction mage. I wear 3 cost reduction gear for destruction: circlet, robe, and ring. My necklace would be fortify magicka or fortify health or some sort of resistance. I kill with incinerate mostly.

Sometimes I play as an illusion mage. I wear master robes of illusion. I go invisible and backstab with dagger.

Sometimes I play as an alteration mage. I wear master robes of alteration. I paralyze everything and kill with dagger and destruction magic.

I am a Battlemage at level 56 and keep all at 380.

150 health, 150 stamina and the rest in magic.
Im a vampire so usually my health and stamina are lower than that.

I typically go 200 in health, 100-150 in stamina, the rest in magic. But I also use magic alot.

160 stamina (more stamina than normal for invisibility sprinting and quick reflex/bashing) 220 magic and 420 health on my spellsword (stopped at 50)

All the fun ends when health goes to 0, it should be pumped, and the more you engage in close combat, the more you will probably want.

I like the idea of finishing combat with health remaining, since menu-pause-potion-chugging is cheese.