I did not imply that this particular 7600 GT beat those higher end cards - considering it's technology (for eg running at 128 bits) it does very well....
Some reviews
http://www.xbitlabs.com/articles/video/display/xfx-7600gt-xxx.html
They did not go against 7900GS though.
http://www.nvnews.net/reviews/xfx_7600gt_xxx/
http://www.legitreviews.com/article/312/1/
I think it all depends on how much money you are prepared to shell out - and how tight your budget is. This card goes for CAD 160 - the GS7900 goes for CAD 226 and higher. Is the performance improvement you get worth the extra CAD 66 - I'm not so sure. Particularly as Direct X 10 is coming out soon.
If I wasn't on a tight budget I'd be looking at the latest C2D and the Geforce 8800
And I'm not looking at overclocking - so whatever I get will be stock.....
Here is the price performance index for the two CPUs
My biggest problem is which MB....