The problem with those cages is that they are too tall. All of the heat will basically be at the top of the cage, where you ball python won't be able to get to. A cage 18" high is really too tall for a ball python of ANY size.

I don't really care what it looks like, i just want it to be right for whatever i get.
if thats true, then plastic caging is for you! A sterilite tub, flexwatt tape, and a good tstat will serve you well.