$300-Experts please build

I asked my question a couple of nights ago and got some excellent responses, but I was thinking I might ask for help in a different way.

I was wondering if the experts would be so kind and put together a wish list that I could look at online from the main online suppliers? My goal is to build the best gaming desktop for the money. I am aware that I will not be playing the latest games with this rig.

* have old pci-e video card I will use temporarily
* upgradeable later
* quad core



Only need these parts:
mid tower
PSU
mobo
cpu
heatsink and fan for cpu
memory
hd

Thanks! I realize $300 rig and gaming do not belong in the same topic or sentence, but I think $300 will be way better than my current system- AMD 2000+ - Geforce 3 Ti500 1GB Ram.