New choices of the cage I should get!

1-I'd probably have to add shelves and stuff- the tiny shelves wouldn't give them much room.
http://cgi.ebay.com/NEW-Cat-Cage-Su...oryZ20740QQrdZ1QQcmdZViewItem#ShippingPayment


2-I've heard that the plastic shelves are kinda weak-I'm worried they would start to slump.
http://cgi.ebay.com/MULTI-LEVEL-FER...QQihZ013QQcategoryZ121854QQrdZ1QQcmdZViewItem


3-I think this one would be good because it will be ok for a while and thne I can add on to it-at least until I find a larger cage.
http://cgi.ebay.com/5-Level-Ferret-...QQihZ015QQcategoryZ116396QQrdZ1QQcmdZViewItem


4-I'm worried b/c it is galvanized
http://cgi.ebay.com/Ferret-Chinchil...QQihZ014QQcategoryZ116396QQrdZ1QQcmdZViewItem


5-I'm worried b/c it is galvanized
http://cgi.ebay.com/6-STORY-Deluxe-...QQihZ014QQcategoryZ116396QQrdZ1QQcmdZViewItem


6- I asked the seller if there was any damage and I asked for more pics to see if it looked ok.
http://cgi.ebay.com/FERRET-PET-CAGE...QQihZ001QQcategoryZ116396QQrdZ1QQcmdZViewItem

I want to make sure I get the best possible!

Tell me what you think is good & bad about each one b/c I plan to the one I'm going to get soon! Also tell me which one you would buy.