Well it looks like you have already got a descent amount of advice. Im a long time collector and cage builder and just recently started selling to the public. I just wanted to throw my two cents in. Now dont get me wrong, im getting back into the forums and trying to help people out not just jumping on here to advertise. I have been posting articles and buying off the classifieds aswell. I would have to say that an acrylic or melamine cage is definetly the easiest to clean and maintain. Most people are getting away from the melamine now because it is so heavy and expands regularly on the edges as its exposed to moisture. Acrylic is nice, light weight.. but normally a cheaper cages that is not built for strength.
We have a good combination going now by using a beautiful furniture grade plywood that is lighter weight. The insides are finely sanded and thinly coated with a clear coat making them water resistant and easy to clean. Using a 220 grit sandpaper and spraying the finish on makes the surface nearly as smooth as plastic. And, there is no better insulator that wood so its easy to control your heat and humidity.
Just to throw it in there Barrs does have nice cages and I have heard nothing but good things about them. Best of luck in the future.
Reptile Snake Cages