I always suggest Martin's Cages
. Heh...I'm also a little biased. Out of four large cages...three are Martin's. Two ferret cages (a customized version of The Ferret Condo - F-475 - and the Two-Story Barn) and a customized cage for our rabbit. Unfortunately, I don't think they're doing customized cages anymore, but their cages are still amazing. They're very sturdy. You can get both galvanized and pvc-coated (the black plastic coating) wire. Drop in or slide-out pans. I don't know about the drop in pans (not sure if they're the same material) but the slide out pans are -very- easy to clean. They're thick, durable plastic and my ferrets have yet to pull the pan out on their own when they're running around in the room. That's a big plus because my guys like to pull out the pan on another cage and go swimming in whatever's fallen underneath...
If you have any ferret shows near you, you ought to see if Martin's is going to be there. Skip Martin goes to -a lot- of the shows (he's up here in Maryland almost every fall and spring). If he's there, you can either go look at the cages he's brought with him and pick one out, or if you wanted to buy one before hand through the website, I've heard he'll bring it with him to the show so you don't have to pay for shipping.
I personally don't really recommend most of the cages that you can find in petstores. Our first seemed like a good cage, but then suddenly Ezra grew and it was way too small and very badly designed. And a lot of the Super Pets cages seem really neat and fun, but they're a pain to clean out. We have one that came with a rescued ferret we picked up at Petco after it had been abandoned there (cage, malnourished ferret, water...no food or litter box
) All of the half-levels have this little groove around the outside which traps any water dripping from Bucky's bottle and mixes it with whatever other bits of food or litter she takes up there and turns it all into a nasty mush. And it's nearly impossible to clean that groove out due to its shape and the fact that the levels are hard to reach through the various doors.
That's 'bout all I know about cages from my experience. There are a lot of neat cage-making companies on the web that I've seen, and they make some very nice and neat looking cages. I'd suggest checking them out before getting one at a petstore. Whichever you pick, make sure to take into account various things like where is the litter box going to go? Can you fit a litter box through the door (a -big- issue...lots of cages don't have doors big enough for the bigger litter boxes or the taller, ferret-specific ones). Is it easy to clean? Is there a good place to put a hammock? Etc. etc. If you can't tell, I spent a lot of time going through cages, and I -still- wish I'd changed a few things.