My setup is very similar. Right now I have a mixture of plastic cages including Boaphile, BoaMaster, Repti-Racks, and ProLine. These are all 4' cages for the adults. For babies and juvies, I have racks from the Boaphile. Eventually, I'm going to upgrade to all one kind of cage. I prefer the ProLine cages (
http://constrictorsnw.com/cagessupply.html) out of the ones I have now. MUCH easier to clean IMO. I also have both white and black cages and I'm definitely going with all white eventually. You can see into the cages way better and they let more light in. For the racks, I'm going to stick with Boaphile and black works well since you can't easily see in anyway.
Here's my cage stack for comparison:
From the top: BoaMaster, Repti-Racks, ProLine, Boaphile.
Oh and I forgot to ad that I prefer the hinged doors over the sliding ones. You can access the whole cage at once as opposed to just one side.
To heat the cages, I use Flexwatt (which goes under the cage on the outside) from the Bean Farm (
http://beanfarm.com/index.php?cPath=1204_1205). I believe I have the 17" so that it covers about 1/3 of the bottom of the cage. To control the temperature, I use a Ranco thermostat which you can find on multiple sites including the Boaphile (
http://www.boaphileplastics.com/thermostat.html). And to keep the humidity right, I just put their water bowls on or partly on top of the heat. I hardly ever have to mist them. I might do it occasionally when they're in shed but it's really not necessary with my setup.
For bedding, I use aspen shavings. I used to use newspaper, but I think the boas prefer the aspen. Plus it's easier to spot clean. Rio Bravo Reptiles has a good care sheet which has a section about bedding and why he prefers aspen (
http://www.riobravoreptiles.com/care_raisingboas.htm). Oh, and make sure you don't use pine or cedar as they are poisonous to boas.
I believe that is everything, hope that helps. Let me know if I missed anything or if you would like me to elaborate on anything.