Cool looking, stays cool, nice amount of fans. Thermaltake has gotta be one of the best mid-high range case manafacturers.
7800GT + eVGA = awesome video card.
Doesn't write DVD's, but most gamers don't need to anyway. It's solid, silver (matches case) and does the job.
Only 74GB of space, but you can buy a 160GB 7200RPM or larger HD in the future if your in need of lots more of space. The 10,000RPM definitely helps in gaming.
Windows XP Home
Doubt you need proffessional, and OEM is always cheaper. It's an OS ...
Decent stock speeds, incredibley OCable.
Nice Solid Antec Truepower 2 PSU.
It's DFI, so it's solid and excellent for OCing. Doesn't support SLI, but SLI is hardly ever worth it
2x1GB of OCZ Gold XTC memory, really fast stuff, and capable of OCing.
Total = ~ $1500
Other components needed: