Ok, so Brisbane is it then. I'll take the advice and buy the 1Gb stick. It's easy enough to come up with another $45 in a few months and dual channel my RAM.
The intel build I posted is cheaper, and it is better than Brisbane 4000+
So which video card is better card for the price?
The GeForce 7600GT - $95
Newegg.com - EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 Video Card - Retail
-or-
The GeForce 8600GT - $125
Newegg.com - MSI NX8600GT-T2D256E OC GeForce 8600GT 256MB 128-bit GDDR3 PCI Express x16 HDCP Video Card - Retail
The only difference I see is the clock speed and DirectX 9 vs. 10
8600GT performs slightly better, but both are good for the price