Well, you dont need any healing.
Im playing a solo sorceror, and i dont need healing, cause i have lots of potions. Right now i have in my inventory 13 potions of extra healing, and thats enough for me
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I have completed all the city quests (including, the eyeless cult, the shadow lich, the elemental lich in the bridge) EXCEPT for Kangaxx and the Twisted Rune. When i finish these two, im gonna go outside (probably to Umar to get Valygar and the stronghold). OH, im level 17 now (about 2.500.000 xp i have, probably i will remove the xp cap).
I would recommend a sorceror, but since most of people dont seem to like it, it would depend on if you are removing the xp cap or not. If you are, you should take the fighter/mage/thief i think. If not, just take a thief/mage or something like this. I think a mage is completely necessary, without one you wont be able to kill wizards, liches etc
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"Let my spells do the dirty work" Ertai, High Sorceror of the Holy Flame