Re: looking to upgrade.
Well all he would have to do is get a new mobo and cpu. Everything else he could keep. It would be about like 600 bucks if he gets one of the good mobo's and one of the lower end Conroes. Throw in a new video card, like a 7600gt, and thats another 150-200 bucks. Add in another gig of ram, for about 100, and you've got yourself a new comp!
Rig -- Emachines T5026, 3.06ghz P4, 300W Bestec PSU, 160 sata hd, 512mb dual channel 3200 ram @ 3-3-5-8, ATI Radeon 9250 pci, dual layer 16x dvd+/-rw.