I have a Gabber Rex, Zoozone1, Imac Fantasy, a Rody and a ferplast Laura. (and I only have 3 hamsters, 2 of which live together
)
I'd definitely recommend the Rex, Zoozone (mesh didn't take much effort - just cut it to size and attached it with cable ties) and the Imac Fantasy. They are roomy and the hamsters love them!
I bought my ZZ from ebay, so it was in second hand (but still useable condition) but then my Mum broke all the clips that held the wire grill on, so I'm currently looking for an imac extension so Marley can move into my un-used Imac Fantasy.
I'd say the Laura and Rody are okay, a bit on the small side though.