Here are a couple pics. Maybe they will help
EVGA 8800GTX in a Lian Li PC65 case (same type HDD cage as the PC A-12 case). Note that right edge of the PCB extends over the drive cage. Clearance is about 1.0 inch.http://img509.imageshack.us/img509/9977/img0113zr9.th.jpg
Same case. This time, the card is an Sapphire Radeon HD 2900XT. The HD 2900XT is approximately an inch shorter than the GTX. Photo gives a good idea of the clearance issue though.http://img490.imageshack.us/img490/5339/img0138qu3.th.jpg
Final image: EVGA 8800GTX in a Lian Li PC-7B. This case has the same internal dimensions as your case, except the HDD cage is slightly truncated. Again, you can see that the right edge of the PCB extends over the drive cage. With this design, there's about 2.0 inches of clearnace.http://img398.imageshack.us/img398/3691/img0134lb8.th.jpg
Sorry, I'm always changing my hardware around and stuff, so these photos are the best I can do. Hope they help a little.