It's filtered unlike the 900, and has built in fan controllers, and super quiet fans.
Also, it has spaces for 9 hard drives, and 3 DVD drives.
Did I mention the extreme cooling?
I paid $200 for both of mine, newegg had them on sale a bit ago for $160 or so.
It includes all the fans you need, including 5 120 tricool cans, and a huge fan, like a 200 or something. On low they really are quiet.
I recommend chaining it down if you want to run all the fans on high.
http://www.newegg.com/Product/Product.a ... %20hundred
I have an antec 900 as well, and I actually transplanted a system out of it into a 1200 because it was too hot in there.
Yeah, it's big and expensive, but cases are the biggest cooling improvement you can make that affects an entire system.