I ran a 9700 pro in my shuttle cube and never had a problem. Truly, give the ATi cards your consideration.... I know for a fact they work well and that there is no problem with space or power consumption while running two hd's, and a cdrw/dvd. I even had a pci card in drawing a bit extra power, too. No problems whatsoever with an SN41g2.
16-55/28, 56/1.2, 18-135, 55-200
Minolta MC 50/1.4, MD 35-70/3.5, 300/4.5 and a bunch more.