I had initially planned to use the mb/cpu/memory from my old computer for the wife's computer, but I've decided to do something different with those. So consider the level of performance she would have gotten from them:
Asus M2N-SLI Deluxe mb
AMD Athlon 6000+ Windsor x2 cpu
4G Kingston cheap ram
I used to game using the above components with the 2 8800gt's, I was reasonably content with their performance at 1280x1024 in games such as WoW and SC2. They definitely struggled at 1920x1200 when I got my new monitor, so I upgraded the rest of the comp and am building the wife something out of the scraps. That's the backstory.