I use Animal Plastics & Freedom Breeders & like them equally for different reasons. The 4' Freedom Breeder racks are really nice & give a lot of floor space for these heavy-bodied snakes. You do have to keep an eye on humidity due to the ventilation in these racks, but talk to Lindy (at Freedom Breeder) and see if he'll cut you plastic tops for the racks or give some guidance on what to use to retain humidity (we've used plastic in the past).
By the same token, I personally also love A)white cages and B) front-opening cages, and am really digging Animal Plastics 4' T-10 cages - here's a pic of some I recently received & set up...can't wait for the rest of them to get here!

And a couple of residents in their new enclosures:


So far these have retained a nice humidity level w/o becoming wet or stagnant, and the temps exactly where I want them using a thermostat on the heat cable. I don't have supplemental heat on in that room at this time (although the whole building is heated) and everything is ticking along very nice & consistent. 
I think you'd have a hard time going wrong with either AP or Freedom Breeder, based on what your preferences are. As with anything, go with what *you* ultimately like best based on your research! 
Hope this helps!
K~
>>Hi everyone, I have some young bloods that are growing fast and I'll need to upgrade their caging soon. I have been researching my options. It looks like a freedom breeder rack (the jumbo 48"w x 6 tall), the boaphile 421D stack or The Animal Plastics T-10. It seems like it would be hard to access the top drawer on the freedom breeder. Also does the freedom breeder retain enough humidity? The 421D looks good but is 11" tall enough for an adult blood? Does the animal plastics have any draw backs? Maybe the heating cable rather than flexwatt? Any opinions about these cages would be helpful. Thanks alot, Andy
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