A few bits from my own experience:
I prefer AP cages to boaphile cages, especially for the money. Racks are an entirely different discussion fwiw.
The next cages I get may be from Constrictors NW, a few personal recommendations from people I respect pointed me in that direction. At the moment it's a toss up between whether I try some 4 foot Constrictors NW cages or go back to AP.
Flexwatt doesn't do it for me for most species when it comes to heating PVC cages because MN winters make for colder indoor air temps. However my diamond crosses do great with just flexwatt!
Use some kind of substrate rather than newspaper with APs. I started with newspaper and now have stains on my white APs.