I went through my collection and picked my top 5.
(left to right: Revlon Copper Penny, Sally Hansen Guilty Pleasure, Orly Rage, Revlon Catty, and Sonia Kashuk Smoke and Mirrors)
Rage by Orly is by far my favorite (and my favorite brand for metallic polish), and probably my most used nail polish. Rage is a beautiful rose gold color. It is opaque after 2 coats and didn't chip easy. Make sure to put down a base coat, it is not easy to get off! Copper Penny comes in a close second, it has a gorgeous rich color and you could probably get away with just one coat, if you are feeling a little lazy!
I think metallic polish can be worn anytime of year, but is quite lovely during the holidays! :)