Thermaltake makes a 250 watt dedicated GPU PSU that fits in a 5.25 drive bay.
Pick one up for $49, install and game worry free. Been keeping my 8800 GTX happy for 9 months. Snap to install, quiet, and rock solid. e6600 at 3.2, 3 gigs ram, 2 big sata drives, 8800 GTX OC'd, 2 dvd/rw's, x-fi, and watercooling rig. 550 TT toughpower running everything but the gpu.
Two 6 pin connectors for the gpu, and one add in for the mainboard connector to turn it on. Power cable runs out the back to the UPS.