My dual wielding rogue had the Warden armor from Warden's Keep. I see no reason why Rogues should walk around in leather if they have the Strength for massive armor - the Warden armor only requires 30 Strength, which any melee main character should easily be able to obtain. In fact, I built him as if he was a Warrior, but with the added bonus of being able to stealth and backstab when flanking. Also, he got some nifty bonuses from the Duelist/Assassin subclasses that a Warrior would not be able to get.
The reason I used that particular armor is due to the extra stamina it provides.