My number one is the animal itself. Does the animal represent the morph well. Are the colors and patterns going to fit in with my plans and other animals I currently own.
My number 2 is the reputation of the breeder. Do I trust buying from this person. If something goes wrong do I have confidence that the breeder will make the situation right.
Both of these things are very important to me and determine not only the quality of the animal but quality of the entire experience and whether I will purchase from an individual again.