Ati RADEON X-1950 XTX 512Mb
A bit old, but was pretty much top shelf when I bought it. Am thinking of going for dual cards when I replace it.
As for CPU, a dual-core Athlon 64 FX-62 @ 2.8GHz w 2GB RAM.
I got all of this back in 2006, so some components are a little old now.
Suppose I might think of building a new one some time, or just replacing video card in the interim.
FYI, anyone wanting to look into graphics cards and other hardware, this is a very handy site:
http://www.tomshardware.com