Something else to keep in mind when deciding racks or cages... racks will need a warmer ambient room temperature than a cage will. A Cage with a properly sized RHP will keep temps where they need to be in a room that is 68-70F with no problem. If you put a rack with only heat tape in a 68 degree room, it's not going to be warm enough, so you'll need to think about that. That was my biggest oversight when going to a rack.