This will be my sister's first computer and I am gonna build it for her for christmas. I built myself an Athlon/Abit KA7 several months ago but don't want to spend that much and my sister doesn't need to overclock. Should I go with a Duron? If so, what's a very stable board for that chip? She will use the computer for e-mail web-surfing, and her kids will be doing some gaming. Celeron suggestions are welcome but will not be counted in the final vote 
