[SOLVED] Will a 600 W PSU support my configuration?

I've decided to get another video card for my system but I'm worried that my power supply might not be able to handle it. Here's my specs:

XFX GeForce 8800GT Extreme 512MB (getting a second one)
Thermaltake Purepower 600 W ATX12V Power
CORSAIR XMS2 4GB (2 x 2GB) SDRAM DDR2 (800)
Western Digital Raptor WD1500ADFD 150GB
Western Digital Caviar 640GB 7200 RPM
LITE-ON 20X DVD±R DVD Burner
ZALMAN CNPS 9700 NT 110mm
eVGA nForce 680i Mobo

I doubt that my 600W PS can supply all my components but I'm not sure. eXtreme Power Supply recommended a 460W PS but that doesn't seem right to me either. There's some options on there I wasn't too sure about.

Any information/suggestions would help a bunch.