www.animalplastics.com
http://www.visionproducts.us/htm7/cages.html
http://www.boaphileplastics.com/
Great companies.
If you are going to get an 8' cage don't even bother with the 6' cage.
I do however suggest getting maybe a 4' cage until he is big enough to go the 8' cage.
I don't know how big a 72qt is so I can't comment on that.
Mike