i have a high elf sorcerer right now and i am using 5 piece light armor all with magicka and two heavy armors with health stats in it. the nice thing with mixing armors is that atleast you will also be able to level up the heavy armors and if you could use atleast one from medium to level them up. and its also important having heavy armors with your character especially on group dungeons for more survivability
Also if you use the undaunted passive "Undaunted Mettle" it increases your magicka, stamina, and health by a percentage for each type of armor you use. So if you have all three types equipped, you get a great bonus from that.
Also if you use the undaunted passive "Undaunted Mettle" it increases your magicka, stamina, and health by a percentage for each type of armor you use. So if you have all three types equipped, you get a great bonus from that.
What Narnizzle says seems to be quite common. Many people I see use 1 of the two types they are NOT primarily using so that they will get a fairly decent boost to all three stats.