The PC I have now is coming close to about 5 years old, the machine I got now is a P4 Northwood 800mhz 3.2ghz chip, gig of ddr400mhz corsair and a 7800gs 256mb agp card so its getting long in the tooth with the latest games. I am wanting to build a machine that will easily last another 4 - 5 years etc
I am planning on dumping the 19" TFT in the future for a much bigger screen or dual 24" TFT's
EDIT:
The other option I have is try and get 2gb of memory for this machine and then update the 7800gs card to the ATi X1950 Pro 512mb card and push another year or two out of my machine