Anyone know how much heavy armor slows down magica regen? I have this idea about a Battle Mage with heavy armor and lots of + magica regen enchantments.

First if I have Morokei (Dragon priest mask w/+100 magica regen) a ring of peerless restoration (another +100 magica regen) and a amulet of ackatosh (+25 magica regen)

Will the effects stack? 225 bonus magica reng?

And is it possible to regenerate magica while casting (I.e. Using sparks on a bad guy infaintly)

Pretty sure armor doesn't effect magic regen. The penalty for wearing armor is the fact that you're not wearing robes which come with at least 50% magic regen.

I would recommend going with cost reduction enchantments instead of magic regen. Magic regen is very slow in combat making it a weak enchantment to have. When you get a high level of enchanting you can reduce the cost of spells to 0, so you can spam destruction spells and focus on health instad of magic.