I've been thinking of a glass tank rather than new cages but mine love to toilet in the corners so it won't work. My gerbils are all in tanks but they are really clean and will only do the toilet in sand baths.
I got an ovo because it was cheap in home bargins when I got Snowy. I soon realised it's too small and he's in a bin cage now. I feel awful that I got him one but it looked really nice.. Anoys me now when I see cages designed for kids that are tiny