A female will be better.
I suggest selling your pastel male and buying a 2 gene male. That way you have 2 genes in one snake. Less time, less space, less mess, less cost in the long run.
If you're keen on a pastel gene male, then perhaps a bumble bee, super pastel, or pastel lesser? Bees and super pastels run pretty cheap these days. (If you get a bee, then you can sell your spider as well to free up space if you're not already attached to him)