I've been keeping a computer I built in 2006 limping along with similar specs as the parts you have (c2d E6700, an asus board I don't remember the model number to, 2 gigs Ram, a low mid geforce card). It was rock solid running XP, but under Win7 is kind of buggy, with random freezing (I think it is graphic-related). Hopefully you'll have better stability issues with whatever set up you go with. I only use it for a media server, so I may throw a linux install on it to see if that helps things...