I have to agree with Pueen. My first stamping kit was from Pueen and I love it. I bought a set of metallic stamping polishes from Amazon just for some variety but the colors were so thin and weak and disappointing. Then I got some Pueen metallic stamping polishes (these) for Christmas and they blew me away again. I'm not sure I'll ever spend money on any stamping polish that isn't Pueen or Born Pretty.

As for plates...either I've just gotten really lucky or maybe the plates themselves don't matter as much as the polish? I think all of my plates are from Pueen or Born Pretty, hah. I got some from Wish and some from Amazon.