I think $75 for a baby pastel is a fair price, especially if the parents are of high quality and the baby is bright.
In my opinion, it starts with how much you can spend and what your goals are.
It looks like since you're willing to wait on the male, I would grab a couple females to begin with and the males later on.
If you are looking to make some combo's, it would take a couple season and some luck (especially with the recessives).
I do love spiders, pastels and axanthics are amazing!
Best of luck to you!