[EXreaction]

Also, if you get this 8800 GS:
Newegg.com - EVGA 384-P3-N851-AR GeForce 8800 GS 384MB 192-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Desktop Graphics / Video Cards

There is a combo deal for 2GB of DDR2 800 (make sure you get the 800 and not the 667) for free.

If you do that you could go with 4 sticks of DDR2, but I'd grab 6GB since you can get that 4GB set I linked to for $50.