The younger/smaller geckos are the hardest to tell for color. So if you get a a good sized juvie you are going to have a better idea of how it will look as an adult.
Knowing what the parents look like may increase the likelyhood of knowing what it will mature into but it can still surprise you.
Here is chewy when I first got her:
Fired up:
And now(not fired up):
I have noticed that the one thing that really stayed the same was that her creams always have this "glow" to them.
Honestly, just pick one that draws you the most! Individual geckos (no matter what morph) will mature differently.