There is also an Icons of the Realms version of Bahamut. Roughly the same size except for wing span.
Let's start with gold, one of my favorite dragon varieties. The Gold Dragon from Deathknell is 1.5" high, in the small or wyrmling category.
The Large Gold Dragon from Night Below is slightly larger and could be called a young dragon.
Another Young Gold Dragon from Dangerous Delves. I really like the wings on this one.
At 5", the Huge Gold Dragon from Giants of Legend is about the size of the typical elder.
The Icons line has two new gold dragons. Both called Gold Dragon, one from Tyranny of Dragons and one from Rage of Demons.
There's also a Gold Shadow Dragon version of the one from Rage of Demons.
Silver is next, the smallest is the Medium Silver Dragon from Underdark.
The Large Silver Dragon from Archfiends is slightly bigger at 2".
The Young Silver Dragon from Dungeons of Dread has some great detail.
Icons of the Realms: Tyranny of Dragons brings a new flying young Silver Dragon.
Another Silver Dragon comes as a promo for the Icons: Elemental Evil set. It is called gargantuan but it's actually elder sized. It appears very similar to the smaller version.
The Brass Dragon from Dragoneye is a wyrmling at 1.5".
The Large Brass Dragon from Unhallowed is a little bigger. This is the typical young dragon size.
Icons: Elemental Evil introduces a new flying young Brass Dragon.
The Icons: Tyranny of Dragons case incentive promo is an Ancient Brass Dragon. This one is elder sized.
Next we have the copper dragons. The Small Copper Dragon from War of the Dragon Queen is a wyrmling.
The Medium Copper Dragon from Blood War is a little bigger at 1.5".
The Large Copper Dragon from Angelfire is 2" or young sized.
The Capricious Copper Dragon is another young dragon.
The Elder Copper Dragon from Lords of Madness.
There are two new coppers from Icons. A young sized one from Rage of Demons.
And the elder sized Copper Dragon from Tyranny of Dragons.
Finally we come to the bronze dragons. The Bronze Wyrmling from Giants of Legend is 1" high.
The Large Bronze Dragon from War Drums, 2".
The new flying young Bronze Dragon from Icons: Elemental Evil.
And the elder Bronze Dragon from Icons: Tyranny of Dragons.
Iron dragons are rarer but there are two of them. The Iron Dragon Prowler from Demonweb is one. It is about 2" or young sized.
The other is the Elder Iron Dragon from Legendary Evils.
The chromatic and undead dragons are covered in D&D Minis Dragon Roundup: Chromatic Edition.