i just come off the phone to dell,got fed up with online chat,it was really that bad. anyway, they said that the above specification pc comes with a 375 watt psu which is not upgradable. they cannot be serious, quad core and 8800gt running off 375w, this is a seriously underpowered pc,thanks for pointing that out skidzy.
I have the XPS and their helpline is in Canada for XPS machines, so of course you get english speaking help, and just as a matter of fact, XPS machines have a 24 hour helpline. unlike all the other Dell models it is a 8 till 5 job.