Ok here's the shot of the BFG 8800GTX in an Antec Nine Hundred case. It's a tight fit.
In the bottom pic, you'll notice that you have to arrange the hard drives or the end of the card will overlap the hard drive by about half an inch. I still have room for a 2nd 8800GTX later and my 4 hard drives. I could also alleviate this by condensing my hard drives or creating a NAS enclosure to move most of my mass storage (fam pics, music, movies) onto the network.
Oh well, hope this helps. The 900 is a very nice case though. Lots of space, nice design, very good airflow, etc...