That mobo won't work with Nvidia video cards. I'd suggest getting another DFI board, one that is Nvidia supported. Definitely don't get XFX for a video card, and definitely don't get a 6800XT. The 6800XT is probably one of the worst cards Nvidia has put out on the market this generation. I'd go with a 6800GS or even a 7800GT since the price of that is falling durastically. That power supply isn't going to cut it either. I'd stick with Antec, OCZ, or Fortron when it comes to a PSU. Other than that, everything else looks pretty good.
AMD 64 3200+ Newcastle@ 2.2Ghz
1GB (1x1GB) OCZ Performance Series
ATI X700 Pro 256MB OC\'d 475/525
OCZ Modstream 520W
Samsung 914v 19\" 12ms LCD
SB X-Fi w/ Logitech Z 5300e