Back to the topic! I like your plan and that was what I had in mind originally: to have just five breeding females. Now I find that's the hardest plan to keep.
If you like pied combos I am surprised that you don't want the hottest pied combo which is albino pied, in my book, in your wishlist.Anyway, I will try to get a nice Enchi combo female within the budget if I were you, good luck.