I can't believe no one said Blossom. I thought she was a pony a lot of people had, so non-collectors would still remember her. I don't remember anything from the cartoons I watched.
1. Firefly
2. Blossom
3. Glory
4. Sundance
5. Applejack
6. Moondancer
When the Head Knocker company made G1 pony bobble heads a few years ago they chose Sundance and Applejack. Not sure if there was research behind that.