HarbingerX
Rob Of The North
Not to muddy the waters any more, but I'll throw my explanation in...
Plate is +8 AC, 50 gp
Magic Plate is +8 AC + Magic Enchantment bonus (+1 to +6), cost is based on Magic Item Level
Magic Warplate is +11 AC + Magic Enchantment bonus (+4 to +6), cost based on Magic Item Level
Magic Godplate is +14 AC + Magic Enchantment bonus (+6), cost based on Magic Item Level.
So:
Plate can give a bonus from +8 to +14 to AC
Warplate can give a bonus from +15 to + 17 AC
Godplate gives a bonus of +20 AC
Practically - once you get to a +4 magic bonus, expect the armor to be Warplate, because you'll be annoyed with the DM if it's just regular Plate and you lose out on the +3 AC difference for the same value. Similarly once you get to +6 and trade up for Godplate.
As an aside, the light armor wearers getting to add their DEX bonus means that they have better AC then the heavy armor wearers at Paragon level. So in the Adventurer's Vault they added additional armors:
Layered Plate (+9, min +2 magic)
Gith Plate (+10, min +3 magic)
Legion Plate (+12, min +5 magic)
So with that you have armor that gives you a +2 (or +3) each time you go up a magic bonus tier.
+8 AC - mundane Plate
+9 AC - Magic +1 Plate
+11 AC - Magic +2 Layered Plate
+13 AC - Magic +3 Gith Plate
+15 AC - Magic +4 Warplate
+17 AC - Magic +5 Legion Plate
+20 AC - Magic +6 Godplate
Plate is +8 AC, 50 gp
Magic Plate is +8 AC + Magic Enchantment bonus (+1 to +6), cost is based on Magic Item Level
Magic Warplate is +11 AC + Magic Enchantment bonus (+4 to +6), cost based on Magic Item Level
Magic Godplate is +14 AC + Magic Enchantment bonus (+6), cost based on Magic Item Level.
So:
Plate can give a bonus from +8 to +14 to AC
Warplate can give a bonus from +15 to + 17 AC
Godplate gives a bonus of +20 AC
Practically - once you get to a +4 magic bonus, expect the armor to be Warplate, because you'll be annoyed with the DM if it's just regular Plate and you lose out on the +3 AC difference for the same value. Similarly once you get to +6 and trade up for Godplate.
As an aside, the light armor wearers getting to add their DEX bonus means that they have better AC then the heavy armor wearers at Paragon level. So in the Adventurer's Vault they added additional armors:
Layered Plate (+9, min +2 magic)
Gith Plate (+10, min +3 magic)
Legion Plate (+12, min +5 magic)
So with that you have armor that gives you a +2 (or +3) each time you go up a magic bonus tier.
+8 AC - mundane Plate
+9 AC - Magic +1 Plate
+11 AC - Magic +2 Layered Plate
+13 AC - Magic +3 Gith Plate
+15 AC - Magic +4 Warplate
+17 AC - Magic +5 Legion Plate
+20 AC - Magic +6 Godplate