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.
Minolta 24/2.8, 50/1.7, 135/2.8, 70-210/4, 100-300 APO, 500/8
Sony 18-135mm SAM
Tamron 28-75/2.8, 90/2.8 Macro, 70-300/4-5.6 USD, 200-400/5.6