A screened cage - all four sides for a Jackson's. I use Petscreen for mine - it's nice to work with and gentle on the cham's toes. It does block an awful lot of light, though. On some of the cages I use 1/4 - 1/2 hardware cloth on top to let in more light from above (I use a combination of bulbs to make the cages brighter). The downside is that you can't really feed roaches, flies or moths with the hardware cloth. Other cages are all Petscreen - but they do need extra light. The Petscreen gives them a bit more privacy - which I like. I've been tossing around the idea of making some removable screen panels to put on top of the cages so I can feed the flying feeders once in awhile and still let alot of light in.
Here's a couple pics of some of my cages:
This one has the hardware cloth on top.
My baby/juvenille cage - all done in Petscreen.