Well if you did get another barred cage, the maxi duna would be in reserve if you decided to get another dwarf hammie
. I have the Barney cage for our Syrian and am very happy with it - but if I was getting one now I would probably get the Savic Hamster Plaza - it's a bit taller (48cm ish tall) so needs some extra shelves, but it has a lovely big front opening door and a door-free roof for tying and hanging loads of stuff to - tunnels, sputniks etc. About the same size as the Alexander.
http://www.petsathome.com/webapp/wcs...E&gclsrc=aw.ds
If you're not bothered about a front opening door, then the Barney has a bit more floor area - 54cm deep.