They are all beautiful!
I have just started with pastels and i am far from your mastery. Do you have some favorite brands but not too expensive?
I've built a modest collection over the years, I don't have them with me at the moment so I'll try my best to remember.
A few years back I splurged on a set of 15 Rembrandts, those things are wonderful. They're on the higher end, so pricey, but definitely worth it. Since then I've gathered a few other sets, some by names I can barely find through a Google search, some very common.
But the ones I use the most often are my Rembrandts (thicker, about a cm in diameter), a set of around 12 NuPastels by Prismacolor (sticks, lovely colour and tend to be harder than most pastels) and a set of pastel pencils from a brand that is completely skipping my mind.
Mostly I think its important to start with what you can, and work from there. There are tons of brands out there, just have to experiment.