I purchased a cat carrier made by the Options brand, who are made by Rosewood and it is excellent. It's so sturdy and my cat loves it! It was so easy to assemble!
My husband didn't realise it needed unclipping before he replaced the door. We take it off as the cat loves it so much he uses it as his basket! As it wasn't unclipped, one of the clips snapped in half. I contacted Rosewood to see if I could buy a replacement clip and they sent me 4 replacements within days for free and didn't even charge postage!!!
I definitely recommend the options pet carriers! http://www.rosewoodpet.com/brands/brand.aspx?bid=47