I have managed to source most of the parts I was running at the time. This was a PC I started to build at the beginning of 2003 with my first salary, I was 16. It started with an XP1800+ and a Geforce 4 MX 440 but by the end of 2003 I managed to upgrade the components to something more beefy and ended up with the following "meta" build (I have maxed the values in this build though, RAM is cheap :D):

MB : Asus A7N8X-E Deluxe (Originally A7N8X Deluxe)

CPU : Athlon XP 2500+ (Barton) @3200+ (FSB 333->400)

RAM : 2 x 1GB PC3200 (Originally 2x256MB PC3200. My first Dual channel setup !

GPU : Ati Radeon 9800 Pro (with VGA Silencer) - Originally a 3D Prophet 9800 Pro Red Edition (really rare) which was RMAed and came back in the classic blue PCB version :(

Case : Antec Super LANBoy (I originally had a shitty one that I managed to find but I keep it for the earlier version of this build with the 1800+ and GF4 MX)

PSU : Hiper Type R 580W (Originally a shitty Heden PSU which exploded while I was playing, I remember the flame light reflecting on the side of my desk :D)

We didn't know it yet but at the time, the Radeon 9800 Pro was severely CPU limited in benchmarks due to the low resolution. On 3dmark99 and 2000, I get almost half the perf with the 3200+ compared to the C2D E7600 with the default settings (and in 2003, 1024x768 was the most common resolution, it is the default one in 3dm2000 as well)

Fortunately HL2 and Far Cry arrived to put this machine at work and make it sweat !

I have kept it for 3 years, which was really good back then. Doom 3 really made it suffer as well but I managed to hold it until 2006.

After my first PC build (Dell XPS R350 from 1998) that I posted last year, this one is probably the one I have enjoyed the most at the time.

I have also found the equivalent pre-built PC I had in between (with a Celeron and i810 combo) and will post it later with what would have been the upgraded version I would have done at the time if I had had money (Voodoo 3 PCI, I can't afford the 5500).