Midnight_V, the latest version of armor I'm thinking about using replaces the PHB armor. Basically, I wanted three types of armor (leather, mail, and plate) with two categories each: light and full. This creates six unique armors, and the fluff can be left to the players. Basically, a full suit covers the bulk of your body, and a light suit focuses primarily on your torso.
Also notice that the AC and max Dex of all light armors add up to +8, +9 for medium, and +10 for heavy. This might need tweaking, but I think it could be an improvement.
My latest version:[spoiler]Several people have suggested droping specific armors and making three types (light, medium, and heavy). How about six types? We could have light and full versions of leather, mail, and plate. I think this gives us a bit more to work with, but still keeps things simple. Here's one implamentation:
Light Armors
Type AC Dex ACP ASF
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Light leather +2 +6 -0 10%
Light mail +4 +4 -2 20%
Medium Armors*
Type AC Dex ACP ASF
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Full leather +4 +5 -2 20%
Full mail +5 +4 -3 25%
Light plate +6 +3 -4 30%
Heavy Armors**
Type AC Dex ACP ASF
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Full plate +9 +1 -6 40%
*The penalty for movement in medium armor is that your run speed is x3 instead of x4
**The penalty for movement in heavy armor is both your run speed is x3 instead of x4 and your speed drops depending on your base speed (40 to 30, 30 to 20, 20 to 15).[/spoiler]