Good size/safe?

Hey y'all I'm lookin into gettin a Syrian hamster and just wanted to know if my lil guy that ill get won't fall off the ramps and hurt himself and if it is good size on any of these? Which one is best for his whole life? The forth and fifth links I'm thinking I could maybe connect together?

P.S. if anyone knows of any better bigger easy to clean easy to attach attachments on to cages are that aren't to expensive I'd like too know please thanks

Click links...

http://www.petco.com/product/113055/WARE-Chew-Proof-Four-Story-Hamster-Cage.aspx

http://www.petco.com/product/113055/WARE-Chew-Proof-Four-Story-Hamster-Cage.aspx

http://www.petco.com/product/113055/WARE-Chew-Proof-Four-Story-Hamster-Cage.aspx

http://www.petco.com/product/113055/WARE-Chew-Proof-Four-Story-Hamster-Cage.aspx

http://www.petco.com/product/113055/WARE-Chew-Proof-Four-Story-Hamster-Cage.aspx