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 50/1.4, 80-200 HS APO G
Sony 18-135mm SAM, 35/1.8 SAM
Tamron Di 90mm/2.8