x2, it sounds like a PVC cage will be the best option for you. PVC cages can stack so you can expand vertically if you decide that you want to.
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Tubs are easy to maintain humidity in, but if the room they are in drops below 75 degrees F for any extended period of time the tub will be very difficult to maintain proper temperatures with. You really can't use heat lamps with tubs. They require under tank heaters, as well as a thermostat to regulate them. You have to heat the entire room with a space heater to 75 F + year round as well for them to really work.