when starting on a low budget to purchase the snakes. you need to get something that's going to help you build a collection of female morphs. my opinion would be something like. buy females. maybe a few pastels and a few normals. raise them up some and then buy a male bee as you were thinking of a bee anyway or killerbee depending on the price in a year or two. the normals you can get fairly cheap even with some size to them. when you breed your male to them, you can produce:

with the male bee to female pastel,
killerbees
bees
superpastels
pastels
spiders
normals

with the male bee to a normal female
bees
spider
pastels
normals

with a killerbee male to a pastel female,
sames as the bee without any normals or spiders

male killerbee to a normal female,
bees
pastels
no normal or spiders

bee = bumble bee

you can make many morphs with these combos, holdback ones you want and trade for morphs you don't have
it's a start, you need to build a base of morph females with size so when you want a combo male that's more than you would like to spend on a single snake, you at least have females to support it.
good luck with your decision, this was just an example and I hope it helps some. don