well, plate mail will actually stand up to a bit of clubbing, but not around the joints. Tearlach, as you say, a full suit of ringmail can seem heavier than plate. I have a chain mail(no leather backing) coif(shoulder/neck guard) that weighs about 10 pounds, so you can work it out to having a full suit be about 80-100 pounds. Chain mail is interesting in terms of damage(and actually, it takes far more than one bad ring to ruin it, but if you\'ve got a couple beside each other....bad) beleive it or not, tightly made chain mail WILL stop a sword from stabbing you(I\'m still alive) but will not stop an arrow(I\'m not THAT crazy) One thing I would like to point out however, that most people don\'t understand, is armour is LOUD. Leather armour creaks and bends, which is fairly loud. Chain mail is louder, wrap 100 feet of chain around you and see how well you can sneak around. Plate is, wow. you sound like a MechWarrior, or a tank. It squeaks, it clanks, and it\'s so heavy, it\'s impossible to move gracefully. My proposal would be to make sneaking IMPOSSIBLE in chain or plate, with a heavy penalty in leather. well, that\'s my armour rant for now...
Jessyn