I've built/assembled the sistem myself.My specs are:
AMD Phenom II 720BE
A-Data 2x2GB Gaming Edition 5-5-5-18 800mhz
Sapphire HD4830 512MB 575/1800
Samsung F1 250GB SataII
Asus DVD-RW w/LightScribe
NoName 600W PSU(I know it's not a good thing but until I'll really need a new psu it will still be good for me)
2x80mm Spire Coolers
+BenQ 22'' Senseye
All of this, execept for the monitor, cost me around 450 Euros(pffff ~600Dolars).
The sistem was bought in April 09 so at the time it was the best bang for the buck.
I has able to push it to almost 14K point in 3dMark 06 with the cpu at 3,6 and the GPU at 700/2200. What do you think? at the time I was on stock cooling on CPU and windows wasn' clean/fresh.
That's the thing with PC's. At the moment it was a decent PII build(and still is). The ideea is that I'm really really happy with it. I don't OC it no more; all games are running very well at 1650x1050 so why to oc it? I could have get the e8400 at the moment for the same money but if you don't oc it it is just a moderate CPU and I'm not so much in OC; I admire offcourse others scores and Ghz's.
In 2-3-4 years when I will change my rig it will be again a "Best Bang For the Buck"(like this one was) and in 5 months it will be moderate and so on...