I think you should pick what appeals to you. My first girl was a ghost and then I added an bumblebee female and a pastel male het to ghost and then I added a black pastel female to get black pewters and then I added a mojo male and Im looking for a mojo female. Oh yea did I forget to mention, Im getting a normal het to piebald from my friend. My suggestion is to go to this link and play around with the different morphs and see what you like. Good luck
http://www.worldofballpythons.com/wizard/