I personally have the Alaska and find it too small for my Syrian Milo and plan to upgrade it to a DIY cage that's going to be either 1,50 x 50 cm or 200 x 60 cm, not sure yet.
My personal minimum for hamster cages (established
before I visited German forums and learned a lot there) is 100 x 50 cm. The Barney cage and Alexander cage from Zooplus are that size and are pretty great as far as I know.
If you don't want a typical hamster cage you could DIY something (Ikea Lack, Ikea Detolf, Ikea Kallax, just Ikea in general. :P) or find an aquarium that's huge.