I have a reptarium I love, it doesn't rust, you can attach things to it with twist ties easily, and they can be very big mine is 4x2x2. I already posted a thread on this and many people recommended the reptarium because it doesn't rust and it's so easy to put together. If you are worried about humidity/temps, just put some plastic painters drop cloth on 3 sides.
i think the reptarium is the same as my felxarium which is very dull and i have a mvb which is bright. and zip is getting broke. so i got the repti breeze as seen some good and bad reviews. try it for a while is no good might see is lll will ship theres to the uk