A glass tank probably wouldn't be bad, but a PVC cage would be better. It's not too difficult to keep the humidity up. I mist mine once a day and adjust the air flow so that it is relatively dry by dusk. I use a small, half gallon pump garden-type sprayer filled with half tap/half distilled water.

As far as agression and big, scary teeth... I think it's blown out of proportion. You're likely to find just as many calm ones as you do bitey ones, although they probably ALL get bitey when the sun comes down. I've handled mine often during the day and have never received so much as a hiss, but she often strikes if I look at her wrong during the night.

My only suggestion would be to keep handling to the very minimum if you get a neonate... for at least a year. Their spines are very fragile and they can kink very easily. A great reference book for GTPs is "The More Complete Chondro" and in it the author mentions that you should treat a neonate as if they are made out of wet paper towels.