Gio beat me to everything there is to say about ConstrictorsNW. I LOVE their cages. To add to the ease of cleaning of a proline cage, last week I did a complete substrate swap and found some caked on urates I had somehow missed in my regular cleanings. I've seen some other plastic cages where these were hard to clean off, and left stains on white cages. Came right off without any sort of effort, and didn't leave any evidence behind.
All I use in my cage heating-wise is a pro-products RHP, as Ed recommended. I couldn't be happier. His customer service is great as well. I had some problems with it at first (my own fault, I had it set up on an uneven surface) and he walked me through correcting them, and I haven't had a single complaint since.
Here's mine, in white. It's a 48x24x18, and I really like the extra height for putting a fussy boa back. I also got cage locks added, and I did my own lighting. Unfortunately, the cage is right in front of my bed and I can't get the whole cage in the shotBut I just wanted to show it in white and lit.
I will be ordering more cages from him in the near future.