You can make it work, but you will have to do a little custom work on the case. It'll just require cutting out a slot/space in the HD cage for the end of the card. That particular card is much longer than reference. You can grind/cut out the slot with a Dremel tool or something. Just be sure to remove everything from the case first....metal dust isn't good for electronics.
In the details tab towards the bottom it says that the maximum video card length is 11" and the video card in question is 11.4" so that video card with this case does not fit. Case size 18.30"x8.10"x18.00"
The space neede is .4" and you may need to do some mod work and after looking at the pictuers of the inside of the case it would be rather easy to make the necessary cuts in the HDD rack to fit the card. You may only need to cut the back side of the HDD rack since the front is fairly close to the side panel.
He linked the one had, the Antec 300. The Antec 300 Illusion uses the same forward mounting drive cage, which is why it also won't fit in that one. The Antec 300 two uses the side mounted drive cage, which is why it would probably fit inside of it. But the original Antec 300 case he has will require some cuts on the drive cage to fit that card.
Thanks for all the help guys, Seems like it will be fairly easy to make it fit. I am okay with case mods having made my own window so i think ill be able to figure it out once it gets here!
However i may just go with the MSI R6950 Twin Frozr III after comparing the two cards the tom's hardware community seems to agree on the MSI card. Which is also only 10.5 inches which will fit in my case without any cuts.