Why are you on such a tight schedule to decide? Reptile auction?

I would go with what Daniel said, buy the 3-4 possible het pied females since they take longer to mature you don't need to keep the male sitting around until they are ready.

And if they don't prove out as pieds, get yourself some nice codom males to breed to the normals!

However, I say go with whatever makes you happiest in the long run because these snakes will be with you for the long haul.

Let us know what you decide.