that looks pretty nice though I just built a new athlon 64 computer and having done some research i really suggest getting a mobo with PCI-Express x16 on the board for video. AGP is becoming outdated technology and the PCI-e cards run MUCH faster than agp, the bottleneck is no longer on video but back on processors speed/bus.
here is what i just built last month
Athlon 64 3200+
MSI Deluxe mobo
1GB DDR400 3200 RAM
GeForce 6600GT pci-e
200GB SATA drive
thing runs lightning fast, i play everquest 2 on NEARLY full graphics (even in the game settings it says currently there is no consumer computer that can run it at full right now). but every other game full graphics and 1100 resolution with no lag at all
do you plan on running x64 windows? i have the beta version my friends dad is a IT guy, it runs really nice. its a 30-40% speed increase on windows based apps (office, windows media, etc)