WARNING SPOILER ABOUNDS!!! ! ! ! !!!
Bunch of text for the average player who does not wish to be spoiled. And now for the spoilers. The Mithril Elven Plate is the best armor in the game(second best IMHO), and is a medium armor. However, it's AC exceeds most heavy armors by far. But I'd take the Chain of Drakkas because it adds no penalty to spellcasting, thieving and is a wicked armor indeed. Both armors are available in the Hand, only the medium armor is available a bit sooner. Dualwielding Ichor and Cera Sumat, or Cera Sumat and Iyachtu's scimitar is madly effective, ben there, done that. As for stats, take off 2 points from DEX, add it to STR, specialise in buff magics and you're off. The charisma has no effect at all if the bonus is negative, so don't worry about that. Eagle's splendor is a cool spell BTW
And yes, I palyed hugely multiclassed characters before, mostly in solo. I think I had a monk1/paladin2/wizard15/ranger1/barbarian1, Drow once. But three is a limit for me, most the best character builds are three-classed. XP and level penalties have a peculiar way of actually speeding up character development. I haven't the time to explain now, but just know that it's so.