Hello and welcome. That is a good looking pastel!
Check out these 2 threads. They are full of great information.
http://ball-pythons.net/forums/showt...ius)-Caresheet
http://ball-pythons.net/forums/showt...04#post1845904
Don't know what your budget is, but PVC cages hold in heat and humidity very well and most have the option of keyed locks. Tubs are great for humidity but heating can be an issue.
Here is a thread on PVC cages:
http://ball-pythons.net/forums/showt...With-Pictures!
What are you using to heat the cage?