[cypher]

I would say no to both cages tbh, if by dwarf you mean a Russian hybrid do be aware that they do have a tendency to fall, they are good at climbing up things but then tend to just let go & fall so even with shelves to break up the height you could still have a potential problem, a lower cage would be a better option by far.
I'm not too up to date with cages right now so not sure if there are any new ones about but although only just big enough really the hamster heaven (used without the penthouse & tubes which can be blocked off) is quite a good cage for a Russian.
The Alaska on Zooplus is a bit bigger but still a little on the tall side so is ok but needs very careful set up to be suitable.