I like Mithral Fullplate +x with greater blurring for my battle sorceror. Guy does like 6d6 damage a hit with his greater walloping warhammer, more if he uses other spells to enhance it. And all of that is just when he gets bored of killing whole armies with meteor swarm and cloudkill.

Mithral Fullplate is really expensive but it's really the best mundane armor for those with 17 or less dex. Even more for the dread commando PrC. Hooray for no acp fullplate!