PSU: http://www.overclock.......&subcat=103
Video Card: http://www.overclock.......&subcat=927
RAM: http://www.overclock.......&subcat=145
That will make a sweet gaming upgrade. There is no need to spend more than as that will bottleneck at your CPU already.
You may want to take some measurements of your case. The 8800 GTS is an oversized card. It will take up the area of two PCI slots. It is also longer than standard ATX boards. Your next step down in cards that I would recommend would be the 1950pro: http://www.overclock.......&subcat=404
Edited by Titan8990, 13 October 2007 - 07:52 PM.