Omg.. that did not look like a mid-tower in the pics. I thought the armor was full-tower only.
I still think it should be able to fit. A 9800gtx was able to fit in my midtower case and a GX2 is the exact same width as an 9800gtx. Except a GX2 takes up one more PCI slot. So the only danger is your HDD drive getting in the way. And like someone said, its removable.