Check the 3GHz C2D Rig system I recommend ... the link is over my signature ...
CPU: Core 2 Duo E4300 Allendale (Retail Box with HSF) - $117
HSF: Stock HSF - $0
-Same CPU and HSF as my build
M/B: BioStar TForce965PT (Open Box) - $52
-Now your cheating, open box isn't always available. And while this is a good motherboard, the Gigabyte ones are better, and it's currently only 5$ more.
RAM: 2x 1GB SuperTalent PC2-5300 DDR2-667MHz CL5 - $83
-I couldn't tell you which memory is better, but it looks like this SuperTalent stuff overclocks pretty well, and it's 5$ cheaper then what I have.
GPU: 7600GT 256MB GDDR3 - $75 ($110-$35MIR)
-The 7600gt is a joke, it is NOT a gaming videocard anymore.
HDD: Seagate 7200.10 160GB SATA2 (3.0Gb/s) - $52
-Your listed harddrive is about $0.33/GB, while a 320GB is $0.25/GB. While it's cheaper, it's not bang-for-your-buck
DVD: 16x DVD Writter - $29
FDD: 1.44" Floppy Disk Drive - $5
-Floppy isn't needed unless you have raid, the Biostar and Gigabyte board both don't support raid.
PSU: ChiefMax 650W $20
-While I understand the need to keep a low price, I wouldn't buy this power supply, ever. Go wash some cars near a busy intersection and accept donations so you can afford something better. This is just asking for trouble.
CASE: Generic Case (without PSU) - $12
-Again, I understand the low price, but I personally wouldn't buy and beige computer case that instantly gives the impression that the computer is a pile of garbage.
FAN: 4x 8CM Fan ($1.50 each) & 1x 12CM Fan ($5 each) - $11
With all this, I know your going to argue your point that it is 450$ for the whole system. But my system is based on bang for buck, spending more or less will 'cause a decrease in overall value. And while less money is good, cheap isn't always better. My system vs your system 450$ vs 800$. 350$ difference is compensating for a videocard thats immensely more powerfull (The 7600gt struggles on new games at 800x600 max quality, while the 8800gts 320MB can run those same games max (0xaa) at 1600x1200). A much higher quality case and power supply that wont fail. I rather spend the extra money.
However, I still appreciate your input, and it clarifies to anyone who is reading this guide for actual research into there new system, and your build brings in the super low budget aspect into view.
Infact, I am going to update my guide with the memory you listed.