Heavy armour is a good choice BUT you might have problems with going for full heavy armor, my spellsword (before I accidently saved over him) had full plate armor but I ditched the helmet for a mage hood.
Haha yeah of course, I just wondered if the perks in heavy armour are more suitable for this role was all
Only the armour effectivness boosters are worth choosing and maybe the hand-to-hand perk are worth getting but aside from that just stick to using your perk points for magic.