Hello and welcome! Just a heads up if no one's mentioned or you didn't realize, but if any of your ponies are the ones that were made in South Africa, those ponies can be pretty sought after! You should definitely check out the Nirvana board and gallery here if you're not sure, but either way I can't wait to see photos of who you have!
I always feel like it's such a shame when people need to part with their childhood herd, but it's nice that you want to pass them on to collectors, and I'm glad you are holding onto your favorites!