If your ultimate goal is to produce a Super Enchi Butterbee, why not focus on that? You could pick up a pair of snakes for around $2000 give or take that would produce such an animal. Something like a Butter Enchi male and a Stingerbee female, or some other combination of the 2 genes. I would get that project taken care of, then get a Pied, or save more for a Lavender.
Looking at your list now, just a Butter Enchi male and an Enchi female could work too. Breed the Butter Enchi to your Spider, hope you hit the triple Butter Enchi Spider male, then breed it to the Enchi. Though I would probably still do the Butter Enchi and Stingerbee over that scenario.