Going to build new PC... Comments plz

Going to do a swap-and-replace job somewher in July / August
Current config (will become development machine)
AMD 2800XP
A7V333 with ATA133 Raid and onboard audio
SB Live 1024
GeForce Ti4200 128MB
1024 MB RAM (2x 512)
40GB Main + 80GB various stuff + 120GB Unrealtournament / FlightSim
Planned new config
Mainboard:
Asus A8N-SLI (2xPCI-E 16, 4xDDR slots)
Nforce 4 SLI with SATA 150, onboard LAN and audio
Processor:
AMD 64 '3200+'
Memory:
1024MB RAM on two modules
Drives
SATA-150 Maxtor Diamondmax 10, 250GB with 16MB cache and 7200 RPM for the gaming stuff
SATA-150 WD360GD, 36GB with 8 MB cache and 10k RPM for the OS and audio stuff.
Video:
Nvidia GeForce 6600GT PCIe, 128MB
Audio
To be installed later, probably SB Live Audigy
Case:
Aopen H700A (have that already), with 4 casefans (have these already too)
PSU
550W Aopen
Current config (will become development machine)
AMD 2800XP
A7V333 with ATA133 Raid and onboard audio
SB Live 1024
GeForce Ti4200 128MB
1024 MB RAM (2x 512)
40GB Main + 80GB various stuff + 120GB Unrealtournament / FlightSim
Planned new config
Mainboard:
Asus A8N-SLI (2xPCI-E 16, 4xDDR slots)
Nforce 4 SLI with SATA 150, onboard LAN and audio
Processor:
AMD 64 '3200+'
Memory:
1024MB RAM on two modules
Drives
SATA-150 Maxtor Diamondmax 10, 250GB with 16MB cache and 7200 RPM for the gaming stuff
SATA-150 WD360GD, 36GB with 8 MB cache and 10k RPM for the OS and audio stuff.
Video:
Nvidia GeForce 6600GT PCIe, 128MB
Audio
To be installed later, probably SB Live Audigy
Case:
Aopen H700A (have that already), with 4 casefans (have these already too)
PSU
550W Aopen