I'm planning on getting two rats soon, but not sure what cage to get. I was looking at some Martin's Cages, specifically the Rat Lodge, but I'm not sure if that will be too small. Should I get the Lodge, or plan ahead and get the Skyscraper as I'm sure I would like to get more rats in the future. (I'm opting for Martin's Cages because they aren't on wheels, and the cage would be on a desk/table.)