My layout is different, there is nothing to the rear of the PCIE slot apart from cables that I could re-route, so I've got about 14" of space before I'd have to worry about it fowling the front of the case.
The GT is the smaller of the 8800 cards isn't it?
You can just see the end of my 7900GS poking out behind my sound card. That's no small card itself.