I would go with the Animal Plastics cages. I use them, and I think they are awesome. For a retic, go with the T25 model or larger, and get them with the sliding glass door, lock, and belly heat options.
These cages solved all of my humidity problems. My retic sheds great in them. They hold heat and humidity great, and the material is 1/2 inch thick. I'm saving up to get some more.
Go with the Animal Plastics cage. The Boaphile cages are good but, the plastic is less thick and they don't have sliding glass options. NERD has some really nice looking 8ft cages, but the price is crazy.
www.animalplastics.com