Hoppinchins regarding your cage I would suggest buying a cage from this site:http://www.qualitycage.com/ These cages are really well built, sturdy, and of high quality. I have had my cage from them for 5 years now and I still love it.
I just decided about a week ago that it was time for a new cage(not because my previous one had worn down, just because I figured it was time for an expansion) so I went ahead and ordered from quality cage co. again for they make really wonderful cages. Their chinchilla cages are mesh wire cages with wooden shelves and a slide out tray. I would recommend the townhome size for your chins. Although when looking at their cages keep in mind that they dont just make chinchilla cages, so be sure your looking at the right kind of cage
I hope this helps! oh and they are a little pricey but they are well worth it.