If you're insistent about having your Shaman in melee combat, I'd consider his weapon options:
simple melee,
longspear.
Consider that last one-- it's a military melee weapon, with
reach. I consider that to be a strong hint on the class designers that a Shaman is supposed to stand behind a defender (or at least his spirit creature) and go stabby stabby from five feet away.
Think about it-- You have a character class with a do-it-yourself-insta wall between you and an enemy, with the ability to strike but not necessarily get struck back.
Who needs armor when you can shift one square back, then use a minor action to summon up that wall again?