Depends if you want to heal. Generally speaking, class skills are superior to weapon skills so every class will have quite the investment in thir magicka pools/regen. However, you also have to factor in your armor also as light armor passives will aid your regen/pools better than heavy. Then you have the decision of mixing your armor in a 5/2 split (possibly) in order to take advantage of multiple armor passives.
It's possible to stack magicka but remember that this game has soft caps that will diminish the effectiveness if you stack beyond the cap (in a sense waste your skill points/attributes).
There's plenty of info on 3rd party site like http://www.reddit.com/r/elderscrollsonline or http://tamrielfoundry.com/forum/classes/game-mechanics/ if you're interested to learn more.
Hope these help and enjoy your time in Tamriel!