A lot of people on here like the Ferret Nation and Critter Nation cages. I don't have either, simply because I didn't know about them when I was originally buying chin cages, but people really do like them, there's even a thread - the Ferret Nation Club - on here where you can see pics.
I have cages from Quality Cage - http:/www.qualitycage.com - and I like them. Not quite as pretty in the house, but they do the job well.
I know some people who have cages from Martins' Cages, which I personally like less, but again, they do the job.
A lot of it depends on how much you want to have to modify the cage, how much you like what it looks like, and so on. For example, the ferret nation cages come with plastic pans, so a lot of people make fleece liners or buy metal pans from _________ (can't think of it right now, someone help here) some website and replace them, and then add in wooden shelves. The quality cages come with wooden shelves, so when you order them, you're set to open up the cage and go, with no modifications. I believe the Martins cages have wire shelving and ramps, which are best removed and made into wood shelving. So some of it depends on what you want to do and modify on your own, and some look better than others.