Heres my 2C worth. I just upgraded in February. I got a case,powersupply,mainboard,Pent 4 @1.5G CPU, 120 megs of rambuss, 2 extra cooling fans and had it delivered all for only $400.(
www.hugebee.com)Then I got a 100G western digital HD for $85 at Sam's club.(local wholesale everything store). Finaly just last month I upgraded my vid card to a GeForce 4 Ti for $ 170 at Best Buy. I am still useing my old monitor,printer,soundcard,scanner and speakers. I also got a free network card from my ISP when I sighned up for DSL service.
Total cost $650