Here's my specs:
3.2 Ghz Pen IV Processor
1.5 GB RAM
320 GB HD (Seagate 7200 RPM)
Nvidia GeForce 7600 GT
I'm getting ready to build my next pc. The AMD X5200 (dual-core) looks really good right now and is dirt cheap (125 American dollars). Make sure you research whatever video card you get. There's a lot more to them then meets the eye... A GeForce 7600GT will max out all but the newest games, and it costs under $100 at newegg.com.
Hope this helps